0001564590-21-020153 | 20-F | XBRL Viewer | Chindata Group Holdings LTD

Print Document View Excel Document

Document and Entity Information	12 Months Ended
Document and Entity Information	Dec. 31, 2020 shares
Document Information [Line Items]
Entity Registrant Name	Chindata Group Holdings Limited
Entity Central Index Key	0001807192
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Type	20-F
Document Period End Date	Dec. 31, 2020
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Shell Company	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Interactive Data Current	Yes
Entity File Number	001-39556
Entity Incorporation, State or Country Code	E9
Entity Address, Address Line One	No. 47 Laiguangying East Road
Entity Address, Address Line Two	Chaoyang District,
Entity Address, City or Town	Beijing
Entity Address, Postal Zip Code	100012
Entity Address, Country	CN
Document Registration Statement	false
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Document Accounting Standard	U.S. GAAP
ICFR Auditor Attestation Flag	false
Business Contact
Document Information [Line Items]
Entity Address, Address Line One	No. 47 Laiguangying East Road
Entity Address, Address Line Two	Chaoyang District,
Entity Address, City or Town	Beijing
Entity Address, Postal Zip Code	100012
Entity Address, Country	CN
Contact Personnel Name	Dongning Wang
City Area Code	400
Local Phone Number	879-7679
Contact Personnel Email Address	ir@chindatagroup.com
Class A Ordinary Shares
Document Information [Line Items]
Entity Common Stock Shares Outstanding	344,577,783
Class B Ordinary Shares
Document Information [Line Items]
Entity Common Stock Shares Outstanding	385,881,598
Class A Ordinary Shares
Document Information [Line Items]
Trading Symbol	CD
Title of 12(b) Security	American Depositary Shares, each representing two Class A ordinary shares, par value US$0.00001 per share
Security Exchange Name	NASDAQ
Class A Ordinary Shares
Document Information [Line Items]
Title of 12(b) Security	Class A ordinary shares, par value US$0.00001 per share
Security Exchange Name	NASDAQ
No Trading Symbol Flag	true

Consolidated Balance Sheets ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Current assets
Cash and cash equivalents	¥ 6,705,612	$ 1,027,680	¥ 1,038,897
Restricted cash	102,598	15,724	14,365
Accounts receivable, net of allowance of RMB4,770 and RMB12,496 (US$1,915) as of December 31, 2019 and 2020, respectively	422,224	64,709	304,695
Value added taxes recoverable	182,982	28,043	80,715
Amount due from related parties	64,093	9,823	88,929
Prepayments and other current assets	112,467	17,234	45,530
Total current assets	7,589,976	1,163,213	1,573,131
Non-current assets
Property and equipment, net	6,423,830	984,495	4,404,587
Operating lease right-of-use assets	635,683	97,423	430,288
Finance lease right-of use assets	144,615	22,163	155,347
Intangible assets	320,299	49,088	360,749
Goodwill	472,883	72,472	466,320
Deferred tax assets	18,789	2,880	3,611
Restricted cash	103,253	15,824	66,578
Value added taxes recoverable	357,125	54,732	247,851
Other non-current assets	193,145	29,600	62,721
Total non-current assets	8,669,622	1,328,677	6,198,052
Total assets	16,259,598	2,491,890	7,771,183
Current liabilities (including current liabilities of the consolidated VIEs without recourse to the primary beneficiary of RMB107,511 and RMB102,267 (US$15,672) as of December 31, 2019 and 2020, respectively):
Short-term bank loans	66,135	10,136	15,000
Current portion of long-term bank loans	230,778	35,368	48,347
Accounts payable	1,186,030	181,767	959,372
Amounts due to related parties	37,468	5,742	60,187
Income taxes payable	47,272	7,245	7,790
Current portion of operating lease liabilities	40,131	6,150	37,767
Current portion of finance lease liabilities	4,906	752	5,485
Derivative liabilities	8,671	1,329	3,159
Accrued expenses and other current liabilities	211,549	32,421	129,672
Total current liabilities	1,832,940	280,910	1,266,779
Non-current liabilities (including non-current liabilities of the consolidated VIEs without recourse to the primary beneficiary of RMB226,933 and RMB212,413 (US$32,554) as of December 31, 2019 and 2020, respectively):
Long-term bank loans	3,892,120	596,493	2,692,154
Operating lease liabilities	204,305	31,311	217,523
Finance lease liabilities	59,986	9,193	61,161
Deferred tax liabilities	254,431	38,993	211,539
Derivative liabilities	16,123	2,471	6,344
Other non-current liabilities	260,225	39,881	78,510
Total non-current liabilities	4,687,190	718,342	3,267,231
Total liabilities	6,520,130	999,252	4,534,010
Shareholders’ equity:
Ordinary shares (par value of US$0.00001 per share, 5,000,000,000 shares authorized, 566,716,480 shares issued and outstanding as of December 31, 2019; 4,500,000,000 Class A ordinary shares authorized, 344,577,783 Class A ordinary shares issued and outstanding; 500,000,000 Class B ordinary shares authorized, 380,214,434 Class B ordinary shares issued and outstanding as of December 31, 2020)	46	7	34
Additional paid-in capital	10,510,516	1,610,807	3,512,291
Statutory reserves	82,792	12,688	13,908
Accumulated other comprehensive income (loss)	(172,586)	(26,450)	40,011
Accumulated deficit	(681,300)	(104,414)	(329,071)
Total shareholders’ equity	9,739,468	1,492,638	3,237,173
Total liabilities and shareholders’ equity	¥ 16,259,598	$ 2,491,890	¥ 7,771,183

Consolidated Balance Sheets (Parenthetical) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥) shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 CNY (¥) shares
Accounts receivables, allowance	¥ 12,496	$ 1,915	¥ 4,770
Current liabilities	1,832,940	280,910	1,266,779
Non-current liabilities	¥ 4,687,190	$ 718,342	¥ 3,267,231
Common stock, par value per share \| $ / shares		$ 0.00001
Common stock, shares authorized	5,000,000,000	5,000,000,000	5,000,000,000
Common stock, shares, issued			566,716,480
Common stock, value, outstanding			566,716,480
VIEs
Current liabilities	¥ 1,226,685	$ 187,997	¥ 1,105,046
Non-current liabilities	212,413	32,554	226,933
VIEs \| Nonrecourse
Current liabilities	102,267	15,672	107,511
Non-current liabilities	¥ 212,413	$ 32,554	¥ 226,933
Class A Ordinary Shares
Common stock, shares authorized	4,500,000,000	4,500,000,000
Common stock, shares, issued	344,577,783	344,577,783
Common stock, value, outstanding	344,577,783	344,577,783
Class B Ordinary Shares
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares, issued	380,214,434	380,214,434
Common stock, value, outstanding	380,214,434	380,214,434

Consolidated Statements of Comprehensive Loss $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥) ¥ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 CNY (¥) ¥ / shares shares	Dec. 31, 2018 CNY (¥) ¥ / shares shares
Revenue
Total revenue	¥ 1,831,077,000	$ 280,625	¥ 853,010,000	¥ 98,484,000
Cost of revenue
Gross profit	732,781,000	112,304	242,789,000	(36,776,000)
Operating expenses
Selling and marketing expenses	(99,092,000)	(15,187)	(47,496,000)	(5,092,000)
General and administrative expenses	(564,286,000)	(86,481)	(232,837,000)	(57,980,000)
Research and development expenses	(41,175,000)	(6,310)	(24,510,000)
Impairment of goodwill	0		0	(21,598,000)
Total operating expenses	(704,553,000)	(107,978)	(304,843,000)	(84,670,000)
Operating (loss) income	28,228,000	4,326	(62,054,000)	(121,446,000)
Interest income	27,616,000	4,232	7,161,000	97,000
Interest expense	(238,384,000)	(36,534)	(102,290,000)	(24,344,000)
Foreign exchange gain (loss)	(3,548,000)	(544)	(2,438,000)	808,000
Changes in fair value of financial instruments	(12,717,000)	(1,949)	(11,189,000)	2,643,000
Others, net	(17,201,000)	(2,636)	(633,000)	1,322,000
Loss before income taxes	(216,006,000)	(33,105)	(171,443,000)	(140,920,000)
Income tax benefit (expense)	(67,339,000)	(10,320)	1,742,000	2,759,000
Net loss	(283,345,000)	(43,425)	(169,701,000)	(138,161,000)
Less: Net income attributable to non-controlling interests			4,742,000
Net loss attributable to Chindata Group Holdings Limited	¥ (283,345,000)	$ (43,425)	¥ (174,443,000)	¥ (138,161,000)
Net loss per share:
Basic and diluted \| (per share)	¥ (0.46)	$ (0.07)	¥ (0.44)	¥ (1.42)
Shares used in the net loss per share:
Basic and diluted \| shares	613,673,576	613,673,576	397,153,121	97,550,502
Other comprehensive income (loss), net of tax of nil:
Foreign currency translation adjustments	¥ (212,597,000)	$ (32,582)	¥ 21,967,000	¥ 18,032,000
Comprehensive loss	(495,942,000)	(76,007)	(147,734,000)	(120,129,000)
Less: Comprehensive income attributable to non-controlling interests			4,742,000
Comprehensive loss attributable to Chindata Group Holdings Limited	(495,942,000)	(76,007)	(152,476,000)	(120,129,000)
Colocation Services
Revenue
Total revenue	1,701,911,000	260,829	678,348,000
Cost of revenue
Cost of revenue	(960,586,000)	(147,216)	(422,254,000)
Colocation Services \| Third Party
Revenue
Total revenue	1,618,857,000	248,100	583,277,000
Colocation Services \| Related Party
Revenue
Total revenue	83,054,000	12,729	95,071,000
Colocation Rental
Revenue
Total revenue	124,991,000	19,156	128,870,000	93,423,000
Cost of revenue
Cost of revenue	(135,160,000)	(20,714)	(152,961,000)	(132,766,000)
Others
Revenue
Total revenue	4,175,000	640	45,792,000	5,061,000
Cost of revenue
Cost of revenue	¥ (2,550,000)	$ (391)	¥ (35,006,000)	¥ (2,494,000)

Consolidated Statements of Changes in Shareholders' Equity
¥ in Thousands, $ in Thousands

CNY (¥)

USD ($)

Ordinary Shares

CNY (¥)

Ordinary Shares

USD ($)

Additional Paid-In Capital

CNY (¥)

Additional Paid-In Capital

USD ($)

Statutory Reserves

CNY (¥)

Statutory Reserves

USD ($)

Accumulated Other Comprehensive Income (Loss)

CNY (¥)

Accumulated Other Comprehensive Income (Loss)

USD ($)

Accumulated Deficit

CNY (¥)

Accumulated Deficit

USD ($)

Total Chindata Group Holdings Limited Shareholders' Equity

CNY (¥)

Total Chindata Group Holdings Limited Shareholders' Equity

USD ($)

Non-Controlling Interests

CNY (¥)

Beginning Balance at Dec. 31, 2017

¥ 834

¥ 3,381

¥ 12

¥ (2,559)

¥ 834

Beginning balance, shares at Dec. 31, 2017 | shares

Net (loss) income

(138,161)

Issuance of ordinary shares

795,186

¥ 8

795,178

795,186

Issuance of ordinary shares, shares | shares

168,092,122

Other comprehensive income (loss)

18,032

Ending Balance at Dec. 31, 2018

675,891

¥ 8

798,559

18,044

(140,720)

675,891

Ending balance, shares at Dec. 31, 2018 | shares

168,092,123

Net (loss) income

(169,701)

(174,443)

¥ 4,742

Issuance of ordinary shares

2,345,270

¥ 23

2,345,247

2,345,270

Issuance of ordinary shares, shares | shares

370,288,533

Capital contribution from non-controlling interests of a subsidiary

^[1]

300,000

Purchase of non-controlling interests

^[1]

¥ 3

304,739

304,742

¥ (304,742)

Purchase of non-controlling interests, shares | shares

^[1]

28,335,824

Share-based compensation (Note 12)

63,746

Appropriation of statutory reserves

¥ 13,908

(13,908)

Other comprehensive income (loss)

21,967

Ending Balance at Dec. 31, 2019

¥ 3,237,173

¥ 34

3,512,291

13,908

40,011

(329,071)

3,237,173

Ending balance, shares at Dec. 31, 2019 | shares

566,716,480

Net (loss) income

¥ (283,345)

$ (43,425)

(283,345)

Issuance of ordinary shares

1,769,645

¥ 4

1,769,641

1,769,645

Issuance of ordinary shares, shares | shares

46,075,737

Share issuance upon the initial public offering (“IPO”) and concurrent private placements, net of issuance costs

4,858,617

¥ 8

4,858,609

4,858,617

Share issuance upon the initial public offering (“IPO”) and concurrent private placements, net of issuance costs, shares | shares

112,000,000

Share-based compensation (Note 12)

369,975

Appropriation of statutory reserves

68,884

(68,884)

Other comprehensive income (loss)

(212,597)

Ending Balance at Dec. 31, 2020

¥ 9,739,468

$ 1,492,638

¥ 46

$ 7

¥ 10,510,516

$ 1,610,807

¥ 82,792

$ 12,688

¥ (172,586)

$ (26,450)

¥ (681,300)

$ (104,414)

¥ 9,739,468

$ 1,492,638

Ending balance, shares at Dec. 31, 2020 | shares

724,792,217

[1]

On March 14, 2019, the non-controlling interests made a pro-rata contribution to a subsidiary of the Group. In July 2019, the Company subsequently repurchased this outstanding non-controlling interests through the issuance of ordinary shares amounting to US$44,118. The acquisition of the non-controlling interests by the Company was accounted for as an equity transaction. The difference between the consideration transferred and the carrying amount of the non-controlling interests is recognized as an adjustment to additional paid-in capital.

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) $ in Thousands	1 Months Ended
	Jul. 31, 2019 USD ($)
Statement Of Stockholders Equity [Abstract]
Repurchase of outstanding non-controlling interests through issuance of ordinary shares	$ 44,118

Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
Consolidated Statements of Cash Flows $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	¥ (283,345,000)	$ (43,425)	¥ (169,701,000)	¥ (138,161,000)
Adjustments to reconcile net loss to net cash (used in) generated from operating activities:
Depreciation and amortization	410,694,000	62,942	241,175,000	88,630,000
Non-cash expense relating to prepaid land use rights	2,860,000	438	1,249,000
Share-based compensation	349,846,000	53,616	63,746,000
Impairment of goodwill	0		0	21,598,000
Loss (gain) on disposal of long-lived assets	(6,528,000)	(1,000)	47,000
Allowance for doubtful accounts	3,850,000	590	5,265,000	80,000
Deferred income taxes	7,375,000	1,130	(2,373,000)	(3,314,000)
Changes in fair value of financial instruments	12,717,000	1,949	11,189,000	(2,643,000)
Foreign exchange (gain) loss	3,548,000	544	2,438,000	(808,000)
Loss on debt extinguishment			4,567,000
Amortization of debt issuance cost	33,455,000	5,127	10,887,000	1,027,000
Changes in operating assets and liabilities:
Accounts receivable	(121,890,000)	(18,680)	(160,595,000)	4,003,000
Amount due from related parties	88,887,000	13,623	(420,000)
Value added taxes recoverable	6,900,000	1,057	(11,482,000)
Prepayments and other current assets	(38,934,000)	(5,967)	(11,225,000)	12,587,000
Operating lease right-of-use assets	10,800,000	1,655	(7,065,000)	401,000
Other non-current assets	(3,510,000)	(538)	12,797,000	(1,475,000)
Accounts payable	21,236,000	3,255	46,274,000	(20,424,000)
Income taxes payable	28,622,000	4,387	(1,007,000)	(201,000)
Amount due to related parties	(61,740,000)	(9,462)	(32,578,000)	191,000
Accrued expenses and other current liabilities	69,142,000	10,596	29,988,000	7,855,000
Operating lease liabilities	(10,854,000)	(1,663)	5,510,000	(258,000)
Other non-current liabilities	141,779,000	21,728	1,481,000	5,311,000
Net cash (used in) generated from operating activities	664,910,000	101,902	40,167,000	(25,601,000)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property and equipment and intangible assets, net of proceeds from sale of property and equipment	(2,424,647,000)	(371,593)	(1,611,253,000)	(1,052,317,000)
Purchase of land use rights	(287,630,000)	(44,081)	(30,346,000)
Cash paid for business combination, net of cash acquired	(22,992,000)	(3,524)	(1,879,040,000)
Cash paid for equity method investment	(34,000,000)	(5,211)
Net cash used in investing activities	(2,769,269,000)	(424,409)	(3,520,639,000)	(1,052,317,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of ordinary shares	1,810,200,000	277,425	2,274,133,000	866,323,000
Proceeds from IPO and concurrent private placements, net of issuance cost	4,871,804,000	746,637
Principal portion of finance lease payments	(18,441,000)	(2,826)	(11,105,000)	(75,851,000)
Proceeds from short-term bank loans	68,971,000	10,570	15,000,000
Proceeds from long-term bank loans	1,743,315,000	267,175	2,408,457,000	407,247,000
Payment of debt issuance cost	(47,128,000)	(7,223)	(68,897,000)	(10,785,000)
Contribution from non-controlling interests of a subsidiary			300,000,000
Repayment of short-term bank loans	(15,000,000)	(2,299)
Repayment of long-term bank loans	(224,919,000)	(34,470)	(461,260,000)	(9,562,000)
Net cash generated from financing activities	8,188,802,000	1,254,989	4,456,328,000	1,177,372,000
Exchange rate effect on cash, cash equivalents and restricted cash	(292,820,000)	(44,877)	(719,000)	19,891,000
Net increase in cash, cash equivalents, and restricted cash	5,791,623,000	887,605	975,137,000	119,345,000
Cash, cash equivalents and restricted cash at beginning of year	1,119,840,000	171,623	144,703,000	25,358,000
Cash, cash equivalents and restricted cash at end of year	6,911,463,000	1,059,228	1,119,840,000	144,703,000
Supplemental disclosures of cash flow information:
Cash and cash equivalents	6,705,612,000	1,027,680	1,038,897,000	104,207,000
Restricted cash	205,851,000	31,548	80,943,000	40,496,000
Interest expense paid	197,581,000	30,281	83,872,000	14,295,000
Income taxes paid	27,774,000	4,257	1,020,000	206,000
Supplemental disclosures of non-cash information:
Purchase of property and equipment included in accounts payable	¥ 1,121,253,000	$ 171,840	524,843,000	¥ 9,086,000
Purchase of non-controlling interests through issuance of ordinary shares			¥ 304,742,000

Organization

12 Months Ended

Dec. 31, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

ORGANIZATION

1. ORGANIZATION

Chindata Group Holdings Limited (the “Company”) is a limited liability company incorporated in the Cayman Islands on December 27, 2018. The Company, its subsidiaries, the variable interest entities, and subsidiaries of the variable interest entities are hereinafter collectively referred to as the “Group”. The Group is principally engaged in the provision of internet data center (“IDC”) colocation and rental services in Asia-Pacific emerging markets. The Company does not conduct any substantive operations on its own but instead conducts its primary business operations through its subsidiaries, the variable interest entities, and subsidiaries of the variable interest entities, which are primarily located in the People’s Republic of China (the “PRC” or “China”), and Malaysia. As described below, the Company, through a series of transactions which are accounted for as a reorganization of entities and transfer of businesses under common control (the “Reorganization”), became the parent entity of its subsidiaries, the variable interest entities and the subsidiaries of the variable interest entities. Accordingly, these consolidated financial statements reflect the historical operations of the Company as if the current organization structure had been in existence throughout the periods presented.

Reorganization

In preparation for the Company’s planned initial public offering (“IPO”) in the United States, the following transactions were undertaken to reorganize the legal structure of the Company and to transfer the IDC colocation and rental businesses to the Company.

(i)

Integral Investments South Asia III was incorporated on March 24, 2016 and, on November 1, 2017, acquired Bridge Data Centres Malaysia Sdn Bhd, which is engaged in the IDC rental business (collectively, “Bridge Group”). The ultimate controlling shareholder of Investments South Asia III was the same as the Company.

(ii)

On November 27, 2018, Stack Midco Limited was incorporated as a limited liability company in the Cayman Islands. The ultimate controlling shareholder of Stack Midco Limited is the same as the Company. On April 26, 2019, Stack Midco Limited purchased 100% equity interest of Chindata (Xiamen) Science and Technology Co., Ltd. (“Chindata Xiamen”), which is engaged in the IDC colocation business for a total purchase consideration of approximately RMB2,772,317 (Note 16). Stack Midco Limited together with Chindata Xiamen are collectively hereinafter referred to as the Stack Group.

(iii)

On July 15, 2019 (“Reorganization Date”), the Company entered into a series of business and assets transfer agreements with Stack Group and Bridge Group, respectively, pursuant to which Stack Group and Bridge Group transferred all the operating assets and liabilities related to their IDC colocation and rental businesses, respectively, to the Company.

As all the Company, Integral Investments South Asia III and Stack Midco Limited are under common control before and after the Reorganization Date, the Reorganization is accounted for in a manner similar to a pooling-of-interest with the assets and liabilities of the parties to the Reorganization carried over at their historical amounts. All of the revenues and costs of conducting the IDC colocation and rental businesses incurred by Stack Group and Bridge Group, respectively, prior to the Reorganization but after the ultimate controlling shareholder obtained control were reflected in the Company’s consolidated statements of comprehensive loss.

On July 30 and July 31, 2020, several investors acquired an aggregate of 36,860,590 ordinary shares of the Company at US$5.43 per share.

On August 14 and August 18, 2020, several investors acquired an aggregate of 119,796,921 ordinary shares of the Company at US$5.43 per share (“Pre-IPO private placements”). Among which, 9,215,147 shares were newly issued and 110,581,774 shares were sold and transferred from existing shareholders of the Company.

In September 2020, the Company’s shareholders approved the dual-class share structure such that ordinary shares will consist of Class A ordinary shares and Class B ordinary shares, which will become effective immediately prior to the completion of the Company’s IPO.

On October 2, 2020, the Company completed its IPO on the NASDAQ Global Select Market. The Company offered 40,000,000 ADSs representing 80,000,000 Class A ordinary shares at US$13.50 per ADS. Concurrently with the IPO, several investors purchased 10,000,000 ADSs at US$13.50 per ADS, representing 20,000,000 Class A ordinary shares (“Concurrent Private Placements”). Additionally, the underwriters exercised their options to purchase an additional 6,000,000 ADSs representing 12,000,000 Class A ordinary shares at US$13.50 per ADS. Net proceeds from the IPO including the over-allotment option and the Concurrent Private Placements after deducting underwriting discount and issuance cost were RMB4,871,804 (US$746,637). Upon completion of the IPO, all outstanding ordinary shares were converted on a one-for-one basis into 338,584,043 Class A ordinary shares and 386,208,174 Class B ordinary shares, respectively.

1. ORGANIZATION (Continued)

As of December 31, 2020, the Company’s principal subsidiaries, variable interest entities, and subsidiaries of the variable interest entities, are as follows:

Name	Date of establishment/ acquisition	Place of establishment	Percentage of equity interest attributable to the Company			Principal activities
Stack Midco Limited	November 27, 2018	Cayman		100	%	Investment holding
Suzhou Stack Data Technology Company Limited (“Suzhou Stack”)*	December 10, 2018	PRC		100	%	Provision of technical and consulting services
Hebei Stack Data Technology Company Limited (“Hebei Stack”)*	July 10, 2019	PRC		100	%	Provision of technical and consulting services
Chindata (Xiamen) Science and Technology Co., Ltd.	April 26, 2019	PRC		100	%	Provision of technical and consulting services
Chindata (Hebei) Co., Ltd.	April 26, 2019	PRC		100	%	Provision of technical and consulting services
Datong Qinhuai Data Company Limited	April 26, 2019	PRC		100	%	Provision of technical and consulting services
Bridge Data Centres Malaysia Sdn Bhd	November 1, 2017	Malaysia		100	%	Provision of IDC colocation rental services
Variable interest entities:
Sitan (Beijing) Data Technology Company Limited (“Beijing Sitan”)	December 19, 2018	PRC	Nil			Provision of IDC colocation services
Hebei Qinshu Information Technology Company Limited (“Hebei Qinshu”)	July 10, 2019	PRC	Nil			Provision of IDC colocation services
Variable interest entities’ subsidiaries:
Chindata (Beijing) Co., Ltd.	April 26, 2019	PRC	Nil			Provision of IDC colocation services
Sidake Hebei Data Technology Company Limited	April 26, 2019	PRC	Nil			Provision of IDC colocation services
Datong Sitan Data Science and Technology Co., Ltd.	April 26, 2019	PRC	Nil			Provision of IDC colocation services
Chindata (Shenzhen) Co., Ltd.	April 26, 2019	PRC	Nil			Provision of IDC colocation services

*	each or collectively referred to as the “WFOE”.

To comply with PRC laws and regulations which prohibit foreign control of companies that engage in value-added telecommunication services, the Group primarily conducts its business in the PRC through its variable interest entities, Beijing Sitan and Hebei Qinshu, and subsidiaries of the variable interest entities (collectively, the “VIEs”). The equity interests of the VIEs are legally held by PRC shareholders (the “Nominee Shareholders”). Despite the lack of technical majority ownership, the Company has effective control of the VIEs through a series of contractual arrangements (the “Contractual Agreements”) and a parent-subsidiary relationship exists between the Company and the VIEs. Through the Contractual Agreements, the Nominee Shareholders effectively assigned all of their voting rights underlying their equity interests in the VIEs to the WFOE, who immediately assigned the voting rights underlying their equity interests in the VIEs to Stack Midco Limited, which is a wholly-owned subsidiary of the Company. Therefore, the Company has the power to direct the activities of the VIEs that most significantly impact its economic performance. The Company also has the ability and obligation to absorb substantially all of the profits and all the expected losses of the VIEs that potentially could be significant to the VIEs. Based on the above, the Company consolidates the VIEs in accordance with SEC Regulation SX-3A-02 and Accounting Standards Codification (“ASC”) 810, Consolidation (“ASC 810”).

The following is a summary of the Contractual Agreements:

1. ORGANIZATION (Continued)

Power of Attorneys

Pursuant to the Power of Attorneys among Suzhou Stack, Beijing Sitan and its Nominee Shareholders, the Nominee Shareholders agreed to entrust to the Suzhou Stack an irrevocable proxy to exercise all of their voting rights as shareholders of Beijing Sitan and approve on behalf of the Nominee Shareholders, all related legal documents pertinent to the exercise of their rights in their capacity as the shareholders of Beijing Sitan. Suzhou Stack is also entitled to transfer or assign its voting rights to any other person or entity at its own discretion and without giving prior notice to the Nominee Shareholders or obtaining their consent. The Power of Attorneys remains valid for as long as the Nominee Shareholders remains shareholders of Beijing Sitan. Suzhou Stack may terminate the Power of Attorneys at its sole discretion, whereas under no circumstances may Beijing Sitan or its Nominee Shareholders terminate this agreement.

The terms of the Power of Attorneys signed amongst Hebei Stack, Hebei Qinshu and its Nominee Shareholders are the same as the terms described above.

Purchase Option Agreement

Pursuant to the Purchase Option Agreement among Suzhou Stack, Beijing Sitan and its Nominee Shareholders, the Nominee Shareholders irrevocably granted to Suzhou Stack or its designees (i) an exclusive option to purchase, when and to the extent permitted under PRC laws, all or part of the equity interests in Beijing Sitan or all or part of the assets held by Beijing Sitan and (ii) an exclusive right to cause the Nominee Shareholders to transfer their equity interest in Beijing Sitan to Suzhou Stack or any designated third party. Suzhou Stack has the sole discretion to decide when to exercise the option, whether in part or full. The exercise price of the option to purchase all or part of the equity interests in Beijing Sitan or assets held by Beijing Sitan will be the minimum amount of consideration permitted under the then-applicable PRC laws. Without the prior consent of Suzhou Stack, Beijing Sitan and its Nominee Shareholders shall not: (i) amend the articles of association, (ii) increase or decrease the registered capital, (iii) sell or otherwise dispose of their assets or beneficial interest, (iv) create or allow any encumbrance on their assets or other beneficial interests, (v) extend any loans to third parties, (vi) enter into any material contracts (except those contracts entered into in the ordinary course of business), (vii) merge with or acquire any other persons or make any investments, or (viii) distribute dividends to their shareholders. The Purchase Option Agreement will remain in effect until all the equity interests held by Nominee Shareholders or the assets held by Beijing Sitan are transferred to Suzhou Stack or its designated party. Suzhou Stack may terminate the Purchase Option Agreement at its sole discretion, whereas under no circumstances may Beijing Sitan or its Nominee Shareholders terminate this agreement. In April 2020, the Purchase Option Agreement was supplemented such that any proceeds received by the Nominee Shareholders from the exercise of the option, distribution of profits or dividends, shall be remitted to Suzhou Stack or its designated person(s), to the extent permitted under PRC laws.

The terms of the Purchase Option Agreement signed amongst Hebei Stack, Hebei Qinshu and its Nominee Shareholders are the same as the terms described above.

Exclusive Business Cooperation Agreement

Pursuant to the Exclusive Business Cooperation Agreement between Suzhou Stack and Beijing Sitan, Suzhou Stack has the exclusive right to provide technical and consulting services to Beijing Sitan related to the IDC business, including but not limited to the technology, management, network support, business consulting, intellectual licensing, equipment or office leasing, market consulting, system integration, product development and system maintenance. Without the prior written consent of Suzhou Stack, Beijing Sitan may not accept any services subject to this Exclusive Business Cooperation Agreement from any third party, while Suzhou Stack has the right to designate any party to provide such services. In return, Beijing Sitan agrees to pay a service fee to Suzhou Stack. Suzhou Stack has the right to unilaterally adjust the service fee. The Exclusive Business Cooperation Agreement has an initial term of ten years, which will be automatically extended for a successive ten-year term upon expiration unless terminated by Suzhou Stack at its sole discretion, whereas under no circumstances may Beijing Sitan terminate this agreement.

The terms of the Exclusive Business Cooperation Agreement signed between Hebei Stack and Hebei Qinshu are the same as the terms described above.

1. ORGANIZATION (Continued)

Equity Pledge Agreement

Under the Equity Pledge Agreement among Suzhou Stack, Beijing Sitan and its Nominee Shareholders, the Nominee Shareholders have pledged all of their equity interests in Beijing Sitan to Suzhou Stack to guarantee performance of Beijing Sitan and their obligations under the Contractual Agreements described above. During the term of the Equity Pledge Agreement, Suzhou Stack has the right to receive all of Beijing Sitan’s dividends and profits distributed on the pledged equity. In the event of a breach by Beijing Sitan or any of its Nominee Shareholders of the contractual obligations under the Equity Pledge Agreement, Suzhou Stack, as pledgee, will have the right to dispose of the pledged equity interests in Beijing Sitan and will have priority in receiving the proceeds from such disposal. Beijing Sitan and its Nominee Shareholders, undertake that, without the prior written consent of Suzhou Stack, they will not transfer, or create or allow any encumbrance on the pledged equity interests. The Equity Pledge Agreement will be valid until Beijing Sitan and its Nominee Shareholders fulfill all contractual obligations under the Contractual Agreement.

The terms of the Equity Pledge Agreement signed amongst Hebei Stack, Hebei Qinshu and its Nominee Shareholders are the same as the terms described above.

Financial Support Undertaking Letter

Pursuant to the financial support undertaking letter, Stack Midco Limited is obligated and hereby undertakes to provide unlimited financial support to the VIEs, to the extent permissible under the applicable PRC laws and regulations, whether or not any such operational loss is actually incurred. Stack Midco Limited will not request repayment of the loans or borrowings if the VIEs or its Nominee Shareholders do not have sufficient funds or are unable to repay.

Resolution of the Board of Directors of Stack Midco Limited

The Board of Directors of Stack Midco Limited resolved that the rights under the Power of Attorneys and the Purchase Option Agreement were assigned to the Board of Directors of Stack Midco Limited or any officer authorized by the Board of Directors.

In the opinion of the Company’s legal counsel, i) the ownership structure of the Company, including its subsidiaries in the PRC and VIEs are in compliance with all existing PRC laws and regulations; and (ii) each of the Contractual Agreements with Stack Midco Limited, the WFOE, VIEs and the Nominee Shareholders governed by PRC laws, are legal, valid and binding, enforceable against such parties, and will not result in any violation of PRC laws or regulations currently in effect; (iii) the resolutions are valid in accordance with the articles of association of Stack Midco Limited and Cayman Islands Law.

However, uncertainties in the PRC legal system could cause relevant regulatory authorities to find the current Contractual Agreements and businesses to be in violation of any existing or future PRC laws or regulations and could limit the Company’s ability to enforce its rights under these contractual agreements. Furthermore, the Nominee Shareholders of the VIEs may have interests that are different from those of the Company, which could potentially increase the risk that they would seek to act contrary to the terms of the Contractual Agreements with the VIEs. In addition, if the Nominee Shareholders will not remain the shareholders of the VIEs, breach, or cause the VIEs to breach, or refuse to renew, the existing Contractual Agreements the Company has with them and the VIEs, the Company may not be able to effectively control the VIEs and receive economic benefits from them, which may result in deconsolidation of the VIEs.

In addition, if the current structure or any of the Contractual Agreements were found to be in violation of any existing or future PRC laws or regulations, the Company may be subject to penalties, including but not be limited to, revocation of business and operating licenses, discontinuing or restricting business operations, restricting the Company’s right to collect revenues, temporary or permanent blocking of the Company’s internet platforms, restructuring of the Company’s operations, imposition of additional conditions or requirements with which the Company may not be able to comply, or other regulatory or enforcement actions against the Company that could be harmful to its business. The imposition of any of these or other penalties could have a material adverse effect on the Company’s ability to conduct its business.

1. ORGANIZATION (Continued)

The following table sets forth the assets, liabilities, results of operations and cash flows of the VIEs included in the Company’s consolidated balance sheets, consolidated statements of comprehensive loss and consolidated statements of cash flows:

	As at December 31,
	2019		2020		2020
	RMB		RMB		US$
Current assets
Cash and cash equivalents		78,706		251,589		38,558
Accounts receivable, net		281,619		399,451		61,219
Amounts due from subsidiaries of the Group		299,240		229,845		35,225
Value added taxes recoverable		11,911		3,367		516
Amounts due from related parties		88,929		35		5
Prepayments and other current assets		3,591		5,715		876
Total current assets		763,996		890,002		136,399
Non-current assets
Property and equipment, net		70,872		64,727		9,920
Operating lease right-of-use assets		251,193		239,155		36,652
Intangible assets		22,706		20,251		3,104
Amounts due from subsidiaries of the Group		300,000		300,000		45,977
Deferred tax assets		—		10,598		1,624
Other non-current assets		8,175		8,783		1,346
Total non-current assets		652,946		643,514		98,623
Total assets		1,416,942		1,533,516		235,022
Current liabilities
Accounts payable		19,569		31,694		4,857
Income taxes payable		174		1,288		197
Amounts due to subsidiaries of the Group		997,535		1,124,418		172,325
Amounts due to related parties		14,539		—		—
Current portion of operating lease liabilities		37,401		38,054		5,832
Accrued expenses and other current liabilities		35,828		31,231		4,786
Total current liabilities		1,105,046		1,226,685		187,997
Non-current liabilities
Operating lease liabilities		217,321		204,305		31,311
Deferred tax liabilities		5,206		3,131		480
Other non-current liabilities		4,406		4,977		763
Total non-current liabilities		226,933		212,413		32,554
Total liabilities		1,331,979		1,439,098		220,551

1. ORGANIZATION (Continued)

	For the year ended December 31,
	2019		2020			2020
	RMB		RMB			US$
Revenue		712,115		1,706,086			261,469
Net income (loss)		29		(52,771	)		(8,088	)
Net cash generated from operating activities		80,433		122,772			18,816
Net cash used in investing activities	(14,762)			(12,115	)		(1,857	)

The revenue-producing assets that are held by the VIEs comprise of property and equipment, and operating lease right-of-use assets. The VIEs contributed an aggregate of 83% and 93% of the Group’s consolidated revenue for the year ended December 31, 2019 and 2020, after elimination of inter-entity transactions.

As of December 31, 2020, there was no pledge or collateralization of the VIEs’ assets that can only be used to settle obligations of the VIEs. Other than the amounts due to subsidiaries of the Group (which are eliminated upon consolidation), all remaining liabilities of the VIEs are without recourse to the Company.

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (“U.S. GAAP”).

Principles of Consolidation

The consolidated financial statements of the Group include the financial statements of the Company, its subsidiaries, and the VIEs for which a wholly-owned subsidiary of the Company is the primary beneficiary. All significant intercompany balances and transactions have been eliminated upon consolidation. Results of subsidiaries, businesses acquired from third parties and the VIEs are consolidated from the date on which control is obtained by the Company.

Use of estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the balance sheet dates and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and assumptions reflected in the Group’s consolidated financial statements include, but are not limited to, allowance for doubtful accounts, the purchase price allocation with respect to business combinations, useful lives of long-lived assets, impairment of long-lived assets and goodwill, realization of deferred tax assets, measurement of right-of-use assets and lease liabilities, legal contingencies, share-based compensation expense, and the fair value of financial instruments. Management bases the estimates on historical experience and various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results could materially differ from those estimates.

Convenience translation

Amounts in U.S. dollars are presented for the convenience of the reader and are translated at the noon buying rate of RMB6.5250 per US$1.00 on December 31, 2020 in the City of New York for cable transfers of RMB as certified for customs purposes by the Federal Reserve Bank of New York. No representation is made that the RMB amounts could have been, or could be, converted into US$ at such rate.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Foreign currency

The Group’s financial information is presented in Renminbi (“RMB”). The functional currency of the Company and the subsidiaries in Cayman is U.S. dollars (“US$”). The functional currency of the Company’s subsidiaries in Malaysia is the Malaysian Ringgit (“MYR”). The functional currency of the Company’s subsidiaries in India is Indian Rupees (“INR”). The functional currency of the Company’s subsidiaries and the VIEs located in the PRC is RMB. Transactions denominated in foreign currencies are re-measured into the functional currency at the exchange rates prevailing on the transaction dates. Monetary assets and liabilities denominated in foreign currencies are re-measured at the exchange rates prevailing at the balance sheet date. Non-monetary items that are measured in terms of historical cost in foreign currency are re-measured using the exchange rates at the dates of the initial transactions. Exchange gains and losses are included in the consolidated statements of comprehensive loss. The Company uses the average exchange rate for the year and the exchange rate at the balance sheet date to translate the operating results and financial position, respectively. Translation differences are recorded in “Accumulated other comprehensive income (loss)”, a component of shareholders’ equity.

Cash and cash equivalents

Cash and cash equivalents consist of cash on hand and time deposits or other highly liquid investments placed with banks which are unrestricted as to withdrawal or use and have original maturities of less than three months.

Restricted cash

Restricted cash primarily represent cash and cash equivalents, pledged as security for the Group’s bank loans.

Accounts receivable and allowance for doubtful accounts

Accounts receivable are carried at net realizable value. An allowance for doubtful accounts is recorded when collection of the full amount is no longer probable. In evaluating the collectability of receivable balances, the Group considers specific evidence including the aging of the receivable, the customer’s payment history, its current credit-worthiness and current economic trends. Accounts receivable are written off when deemed uncollectible.

Capitalized interest

Interest, including amortization of deferred financing costs, associated with major development and construction projects is capitalized and included in construction in progress in accordance with ASC 835, Interest (“ASC 835”). The capitalization of interest commences when expenditure for the asset is being incurred, interest costs are being incurred and activities that are necessary to prepare the asset for its intended use or sale are in progress. The capitalization of interest ceases when the project is substantially completed or the development activity is suspended for more than a brief period. The amount to be capitalized is determined by applying the weighted average interest rate of the Group’s outstanding borrowings to the average amount of accumulated qualifying capital expenditures for assets under construction during the year. Total interest expenses incurred amounted to RMB24,344, RMB120,170 and RMB330,573 (US$50,663), of which nil, RMB17,880 and RMB92,189 (US$14,129) were capitalized for the years ended December 31, 2018, 2019 and 2020, respectively.

Derivative instruments

ASC Topic 815, Derivatives and Hedging (“ASC 815”), requires all contracts that meet the definition of a derivative to be recognized on the balance sheet as either assets or liabilities and recorded at fair value. The Group’s derivatives represent forward exchange rate contracts, and interest rate swap that did not qualify for hedge accounting in accordance with ASC 815. The derivatives are accounted for at fair value by recording the unrealized mark-to-market (fair value adjustment) in each period in the consolidated statements of comprehensive loss within “Changes in fair value of financial instruments”. The notional amounts of the derivative contracts were MYR644,654, US$160,000 and RMB110,000, respectively as of December 31, 2020, and MYR644,654 as of December 31, 2019. A gain of RMB2,643 and loss of RMB12,316 and RMB20,479 (US$3,139) was recognized in the consolidated statements of comprehensive loss for the years ended December 31, 2018, 2019 and 2020, respectively. The estimated fair value of the derivatives are determined at discrete points in time with reference to the market rates using industry standard valuation techniques. The fair value of the Group’s derivatives were determined utilizing market observable forward exchange rates. During all periods presented, there were no changes in valuation technique; or transfers in and out of each level.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Fair value measurements

Financial instruments of the Group primarily include cash and cash equivalents, restricted cash, accounts receivable, derivatives, contingent receivable, amounts due from and due to related parties, accounts payable, certain other current assets and liabilities, short-term bank loans and long-term bank loans. The carrying amount of the long-term bank loans approximates its fair value due to the fact that the related interest rate approximates the interest rates currently offered by financial institutions for similar debt instruments of comparable maturities. The derivatives and contingent receivable were recorded at fair value as determined on the respective issuance or origination date and subsequently adjusted to its fair value at each reporting date. The Group determined the fair values of the derivatives and contingent receivable with the assistance of an independent appraiser. The Group applies ASC 820 Fair Value Measurements and Disclosures (“ASC 820”), in measuring fair value. ASC 820 defines fair value, establishes a framework for measuring fair value and requires disclosures to be provided on fair value measurement. The carrying values of the remaining financial instruments approximate their fair values due to their short-term maturities.

ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

Level 1 — Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.

Level 2 — Include other inputs that are directly or indirectly observable in the marketplace.

Level 3 — Unobservable inputs which are supported by little or no market activity.

ASC 820 describes three main approaches to measuring the fair value of assets and liabilities: (1) market approach; (2) income approach and (3) cost approach. The market approach uses prices and other relevant information generated from market transactions involving identical or comparable assets or liabilities. The income approach uses valuation techniques to convert future amounts to a single present value amount. The measurement is based on the value indicated by current market expectations about those future amounts. The cost approach is based on the amount that would currently be required to replace an asset.

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2019 are summarized below:

	Quoted price in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	RMB		RMB		RMB
Derivative liabilities		—		9,503		—
Contingent receivable (Note 16)		—		—		14,630

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2020 are summarized below:

	Quoted price in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	RMB		RMB		RMB
Derivative liabilities		—		24,794		—
Contingent receivable (Note 16)		—		—		13,609

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Fair value measurements (Continued)

The Group measured the fair value of its contingent receivable on a recurring basis using significant unobservable (Level 3) inputs as of December 31, 2019 and 2020. The valuation of the contingent receivable is performed using Monte Carlo simulation model with unobservable inputs including weighted average cost of capital as well as the performance target, which is assessed by the Group.

The following table presents a reconciliation of all financial instruments measured at fair value on a recurring basis using Level 3 unobservable inputs:

	Contingent receivable
	RMB
Balance as of December 31, 2018		—
Recognized during the year ended December 31, 2019		13,503
Fair value change		1,127
Balance as of December 31, 2019		14,630
Settlement		(8,783	)
Fair value change		7,762
Balance as of December 31, 2020		13,609
The amount of total gain for the year ended December 31, 2020		7,762
The amount of total gain for the year ended December 31, 2020 (US$)		1,190

The Group did not transfer any assets or liabilities in or out of Level 3 during all periods presented.

Equity method investments

The Group’s investments in entities in which the Group can exercise significant influence but does not own a majority equity interest or control are generally accounted for under the equity method of accounting, as the Group concluded it does not have control, but has the ability to exercise significant influence over the investees. Equity method investments are initially measured at cost, and are subsequently adjusted for cash contributions, distributions and the Group's share of the income and losses of the investees. The Group records its equity method investment in “Other non-current assets” in the consolidated balance sheets. The Group's proportionate share of the income or loss from its equity method investment are recorded in “Others, net” in the consolidated statements of comprehensive loss, which is insignificant in 2020. The Group reviews its investment periodically to determine if any investment may be impaired considering both qualitative and quantitative factors that may have a significant impact on the investees' fair value. No impairment loss was recognized for the years presented.

Property and equipment, net

Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets, as follows:

Category		Estimated Useful Life
Buildings		20 to 40 years
Data center equipment		10 to 20 years
Furniture and office equipment		3 to 5 years
Computers and network equipment		5 years
Motor vehicles		5 years
Purchased software		5 years
Leasehold improvements		Lesser of useful life or lease term

Repair and maintenance costs are charged to expense as incurred, whereas the cost of renewals and betterments that extend the useful lives of property and equipment are capitalized as additions to the related assets. Retirements, sales and disposals of assets are recorded by removing the cost and accumulated depreciation from the asset and accumulated depreciation accounts with any resulting gain or loss reflected in the consolidated statements of comprehensive loss.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Direct costs that are related to the construction of property and equipment and incurred in connection with bringing the assets to their intended use are capitalized as construction in progress. Construction in progress is transferred to specific property and equipment, and the depreciation of these assets commences when the assets are ready for their intended use.

Inventories

Inventories consist of materials used in delivering the Group’s other services to the customers, which are stated at the lower of cost and net realizable value. Cost is determined using the weighted average method. Adjustments to reduce the cost of inventory to its net realizable value are made, if required, for decreases in sales price, obsolescence, or similar reductions in the estimated net realizable value. The Group records its inventories in “Prepayments and other current assets” in the consolidated balance sheets. No inventory write-downs were recognized for all years presented.

Intangible assets, net

Intangible assets are carried at cost less accumulated amortization and any recorded impairment. Intangible assets with finite useful lives are amortized using a straight-line method of amortization that reflects the estimated pattern in which the economic benefits of the intangible asset are to be consumed. The estimated useful life for the intangible assets is as follows:

Category		Estimated Useful Life
Acquired customer relationships		5 to 10 years
Acquired license		4 years

Impairment of long-lived assets other than goodwill

The Group evaluates its long-lived assets for impairment whenever events or changes in circumstances, such as a significant adverse change to market conditions that will impact the future use of the assets, indicate that the carrying amount of an asset may not be fully recoverable. When these events occur, the Group evaluates the recoverability of long-lived assets by comparing the carrying amount of the assets to the future undiscounted cash flows expected to result from the use of the assets and their eventual disposition. If the sum of the expected undiscounted cash flows is less than the carrying amount of the assets, the Group recognizes an impairment loss based on the excess of the carrying amount of the assets over their fair value. Fair value is generally determined by discounting the cash flows expected to be generated by the assets, when the market prices are not readily available. For all periods presented, there was no impairment of any of the Group’s long-lived assets.

Segment reporting

In accordance with ASC 280-10, Segment Reporting: Overall, operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker (“CODM”), in deciding how to allocate resources and in assessing performance. The Group operates and manages its business as a single segment through the provision of a single class of standardized IDC services in Asia-Pacific emerging markets. Therefore, the Group’s CODM, who has been identified as the Board of Directors, reviews the consolidated results when making decisions about allocating resources and assessing performance of the Group as a whole (Note 19).

Business combinations

The Group accounts for its business combinations using the purchase method of accounting in accordance with ASC 805, Business Combinations. The purchase method accounting requires that the consideration transferred be allocated to the assets, including separately identifiable assets and liabilities acquired, based on their estimated fair values. The consideration transferred in an acquisition is measured as the aggregate of the fair values at the date of exchange of the assets given, liabilities incurred, and equity instruments issued as well as the contingent considerations and all contractual contingencies as of the acquisition date. The costs directly attributable to the acquisition are expensed as incurred. Identifiable assets, liabilities and contingent liabilities acquired or assumed are measured separately at their fair value as

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Business combinations (Continued)

of the acquisition date, irrespective of the extent of any non-controlling interests. The excess of (i) the total of cost of acquisition, fair value of the non-controlling interests and acquisition date fair value of any previously held equity interest in the acquiree over (ii) the fair value of the identifiable net assets of the acquiree, is recorded as goodwill. If the cost of acquisition is less than the fair value of the net assets of the subsidiary acquired, the difference is recognized directly in earnings.

The determination and allocation of fair values to the identifiable assets acquired, liabilities assumed and non-controlling interests is based on various assumptions and valuation methodologies requiring considerable judgment from management. The most significant variables in these valuations are discount rates, terminal values, the number of years on which to base the cash flow projections, as well as the assumptions and estimates used to determine the cash inflows and outflows. The Group determine discount rates to be used based on the risk inherent in the related activity’s current business model and industry comparisons. Terminal values are based on the expected life of assets, forecasted life cycle and forecasted cash flows over that period.

Acquisitions that do not meet the accounting definition of a business combination are accounted for as asset acquisitions. For transactions determined to be asset acquisitions, the Group allocates the total cost of the acquisition, including transaction costs, to the assets acquired based on their relative fair values.

Goodwill

In accordance with ASC 350, Intangibles—Goodwill and Other (“ASC 350”), the Group assigned and assessed goodwill for impairment at the reporting unit level. A reporting unit is an operating segment or one level below the operating segment. The Group determined that there are two reporting units as of December 31, 2019 and 2020, Bridge Group and Stack Group. Under ASC 350, goodwill is not amortized but is tested for impairment on an annual basis, or more frequently if events or changes in circumstances indicate that it might be impaired. In accordance to Accounting Standards Update (“ASU”) No. 2011-08, Intangibles—Goodwill and Other (“ASU 2011-08”), the Group can elect to perform a qualitative assessment to determine whether the two-step impairment testing on goodwill is necessary. The Group has early adopted ASU 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”), pursuant to which the Group will apply a quantitative test and record the amount of goodwill impairment as the excess of a goodwill allocated to the reporting unit’s carrying amount over its fair value, not to exceed the total amount of goodwill allocated to the reporting unit. The Group fully impaired the goodwill recorded for the year ended December 31, 2018, and no impairment of goodwill was recorded for the years ended December 31, 2019 and 2020 (Note 8).

Asset retirement costs

A majority of the Group’s buildings are self-owned. Therefore, the Group’s asset retirement obligations are limited to its leased building space. The leased building space is subject to long-term arrangements, which in certain cases require the leased building space to be returned to the landlords in its original condition. The fair value of a liability for an asset retirement obligation is recognized in the period in which it is incurred. The corresponding asset retirement costs are capitalized as part of the cost of leasehold improvements and are depreciated over the shorter of the useful life of the asset or the term of the lease subsequent to the initial measurement. The Group accretes the liability in relation to the asset retirement obligations over time and the accretion expense is recorded in cost of revenues. Asset retirement obligations are recorded in other non-current liabilities with the balance of RMB3,885 and RMB3,993 (US$612) as of December 31, 2019 and 2020, respectively.

Comprehensive loss

Comprehensive loss is defined as the changes in equity of the Group during a period from transactions and other events and circumstances excluding transactions resulting from investments by shareholders and distributions to shareholders. Among other disclosures, ASC 220, Comprehensive Income, requires that all items that are required to be recognized under current accounting standards as components of comprehensive loss be reported in a financial statement that is displayed with the same prominence as other financial statements. For each of the periods presented, the Group’s comprehensive loss includes net loss and foreign currency translation adjustments, and is presented in the consolidated statements of comprehensive loss.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Leases

In February 2016, ASU No. 2016-02, Leases (Topic 842) (“ASC 842”) was issued to increase transparency and comparability among organizations by requiring the recognition of right-of-use (“ROU”) assets and lease liabilities in the consolidated balance sheets. Most prominent among the changes in the standard is the recognition of ROU assets and lease liabilities by lessees for those leases classified as operating leases. Under ASC 842, disclosures are required to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The Group elected to early adopt ASC 842 effective January 1, 2017 concurrent with the adoption of Revenue from Contracts with Customers (“ASC 606”) using the modified retrospective approach and applied the transition method at the beginning of the year of adoption.

The Group determines if an arrangement is a lease at inception. The lease agreements include both lease and non-lease components, which the Group availed itself of the practical expedient for lessees and lessors and elected an accounting policy by class of underlying asset to combine lease and non-lease components and account for the combined component in accordance with the accounting treatment for the predominant component. Leases are classified as operating or finance leases in accordance with the recognition criteria in ASC 842-10-25. The Group’s leases do not contain any material residual value guarantees or material restrictive covenants.

Lessee accounting

The Group recognizes ROU assets and liabilities on the lease commencement date based on the present value of lease payments over the lease term. As the rate implicit in the Group’s leases is not typically readily available, the Group uses an incremental borrowing rate based on the information available at the lease commencement date in determining the present value of lease payments. This incremental borrowing rate reflects the fixed rate at which the Group could borrow on a collateralized basis the amount of the lease payments in the same currency, for a similar term, in a similar economic environment. The ROU assets also include any lease payments made, net of lease incentives. Lease terms are based on the non-cancelable term of the lease and may contain options to extend the lease when it is reasonably certain that the Group will exercise that option. Leases with an initial lease term of 12 months or less are not recorded on the consolidated balance sheets.

The Group has lease agreements with lease and non-lease components, which are accounted for as a single lease component based on the Group’s policy election to combine lease and non-lease components for its leases. Variable lease payments not dependent on an index or rate are excluded from the ROU asset and lease liability calculations and are recognized in expense in the period which the obligation for those payments is incurred. Operating lease expense for lease payments is recognized on a straight-line basis over the lease term. A finance lease ROU asset is depreciated on a straight-line basis over the lesser of the useful life of the leased asset or the lease term. Interest on each finance lease liability is determined as the amount that results in a constant periodic discount rate on the remaining balance of the liability.

Lessor accounting

The Group’s lessor portfolio consists of only operating leases for the periods presented. The Group’s policy election is to combine lease and non-lease components, by underlying class of asset, and account for them as one component if they have the same timing and pattern of transfer. The combined component is accounted for in accordance with ASC 842 if the lease component is predominant, and in accordance with ASC 606 if the non-lease component is predominant.

Revenue recognition

Effective January 1, 2017, the Group elected to adopt the requirements of ASC 606 using the full retrospective method. The Group applies the five-step model outlined in ASC 606. The Group accounts for a contract when it has approval and commitment from the customer, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Revenue recognition (Continued)

Revenue is allocated to each performance obligation based on its standalone selling price. The Group generally determines standalone selling prices based on observable prices. If the standalone selling price is not observable through past transactions, the Group estimates the standalone selling price based on multiple factors, including, but not limited to, gross margin objectives, internal costs, and industry technology lifecycles. Timing of revenue recognition is generally the same as the timing of invoicing to customers. Contract assets and contract liabilities were nil as of December 31, 2019 and 2020. Using the practical expedient in ASC 606, the Group does not adjust the promised amount of consideration for the effects of a significant financing component if it expects, at contract inception, that the period between the transfer of the promised good or service to the customer and when the customer pays for that good or service will be one year or less. The Group also elected to exclude sales taxes and other similar taxes from the measurement of the transaction price, and accordingly, recognized revenues net of value added taxes (“VAT”) and surcharges.

Colocation services

The Group provides integrated IDC colocation services including utilities, hosting, cooling, operating and maintaining (collectively, “Colocation Resources”) its customers’ servers and equipment in the Group’s buildings in the PRC. The nature of the Group’s performance obligation is a single performance obligation to stand ready to provide a series of distinct IDC colocation services daily throughout the fixed contract period. The Group is a lessor in some of its IDC colocation service arrangements and the lease component qualifies as an operating lease. Under ASC 842, these contracts qualify for a practical expedient available to lessors to combine the lease and non-lease components and account for the combined component in accordance with the accounting treatment for the predominant component. The Group applied this practical expedient and have accounted for the combined component under ASC 606 because the non-lease components is predominant.

For wholesale and retail data center contracts, the Group’s efforts or inputs are expended evenly throughout the performance period that typically ranges from one to ten years, hence, the Group recognizes revenue over time using a time-based measure, on a straight-line basis. The remaining hyperscale data center contracts include a contractual minimum resulting in a portion of the consideration being fixed (“Fixed Consideration”). The Group’s efforts or inputs are not expended evenly throughout the performance period, which is generally ten years for such contracts. The Fixed Consideration is included in the transaction price for the entire contract period, and recognized as revenue based on cumulative utilization of capacity from contract inception through the end of the reporting period. The variable consideration for each month is allocated to the distinct colocation services for the particular month in accordance with ASC 606-10-32-40 because the variable consideration relates to the Group’s efforts to satisfy the collocation services for that month and reflects the value of the Group’s colocation services delivered to the customer. Therefore, the Group uses monthly utilization records, an output measure, to recognize revenue over time as it most faithfully depicts the simultaneous consumption and delivery of services. At the end of each month, the uncertainty related to the transaction price is resolved based on the utilization records because the variable consideration specifically relates to the transfer of the distinct services during that month.

Colocation rental

The Group rents out hyperscale data center space to customers in Malaysia. The Group applied the practical expedient to account for lease and non-lease components associated with the lease as a single lease component under ASC 842 as the lease component is predominant. Colocation rental revenue is recognized on a straight-line basis over the lease term.

Others

Others mainly includes fiber optic cable and other fitting services provided at the customers’ request. The Group uses construction progress reports, an output measure, to recognize revenue over time provided all revenue recognition criteria have been met, as it most faithfully depicts the Group’s performance toward complete satisfaction of the performance obligation.

As of December 31, 2020, the aggregate amount of transaction price allocated to performance obligations (unsatisfied or partially unsatisfied) is related to colocation services, does not include any variable consideration, and amounted to RMB12,587,598 (US$1,929,134). The Company expects to recognize as revenue 11%, 47% and 42% of these performance obligations within twelve months, one to five years, and after five years, respectively.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Cost of revenues

Cost of revenues consists mainly of utility fees, depreciation of property and equipment, bandwidth costs, rental costs, salaries and benefits for employees directly involved in revenue generation activities, and other expenses directly attributable to the provision of services.

Research and development expense

Research and development expenses primarily consist of salaries and benefits for research and development personnel, and third party service provider costs. The Group expenses research and development costs as they are incurred.

Government grants

Government grants received from provincial and local governments are related to acquisition of assets. The grants are recorded as “deferred government grants” and are included in the “Accrued expenses and other current liabilities”, or “Other non-current liabilities” line items in the consolidated balance sheets when received. Once the Group fulfills the conditions stipulated under the grant, the grant amount will be released to the consolidated statements of comprehensive loss in equal amounts over the expected useful life of the related asset, as a reduction of the related depreciation expense.

Share-based compensation

The Group applies ASC 718, Compensation — Stock Compensation (“ASC 718”), to account for its share-based payments. In accordance with ASC 718, the Group determines whether an award should be classified and accounted for as a liability award or equity award. For equity awards, the related share-based compensation is recognized in the consolidated financial statements based on their grant date fair value, while liability awards are remeasured at each reporting date until settlement. All the Group’s share-based awards are to employees only, the Group, with the assistance of an independent appraiser determined the fair value of the share-based awards granted to employees. The Group uses the accelerated method for all awards granted with graded vesting, and accounts for forfeitures as they occur.

A change in any of the terms or conditions of the awards is accounted for as a modification of the award. Cancellation of the awards accompanied by the concurrent grant of a replacement award is also accounted for as a modification of the terms of the cancelled awards. Incremental compensation cost is measured as the excess, if any, of the fair value of the modified award over the fair value of the original award immediately before its terms are modified, measured based on the fair value of the awards and other pertinent factors at the modification date. For vested awards, the Group recognizes incremental compensation cost in the period the modification occurs. For unvested awards, the Group recognizes over the remaining requisite service period and upon the satisfaction of performance condition, the sum of the incremental compensation cost and the remaining unrecognized compensation cost for the original award on the modification date. If the fair value of the modified award is lower than the fair value of the original award immediately before modification, the minimum compensation cost the Group recognizes is the cost of the original award.

Employee benefit expenses

All eligible employees of the Group in the PRC are entitled to staff welfare benefits including medical care, welfare subsidies, unemployment insurance and pension benefits through a PRC government-mandated multi-employer defined contribution plan. The Group is required to accrue for these benefits based on certain percentages of the qualified employees’ salaries and to make contributions to the plans out of the amounts accrued. The PRC government is responsible for the medical benefits and the pension liability to be paid to these employees and the Group’s obligations are limited to the amounts contributed. The Group recorded employee benefit expenses of nil, RMB16,210 and RMB18,385 (US$2,818) for the years ended December 31, 2018, 2019 and 2020, respectively.

The Group also maintains a government mandated employee provident fund schemes to cover employees of its wholly owned subsidiaries in Malaysia. The employee provident fund schemes are considered a defined contribution plan. Employer and employee contributions are made based on various percentages of salaries and wages that vary based on employee age and other factors. The Group’s contributions into the program amounted to RMB1,082, RMB1,150 and RMB1,049 (US$161) for the years ended December 31, 2018, 2019 and 2020, respectively.

The Group has no further payment obligations once the contributions have been paid.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Loss per share

In accordance with ASC 260, Earnings Per Share, basic loss per share is computed by dividing net loss attributable to the Company by the weighted average number of ordinary shares outstanding during the period. Diluted loss per share is calculated by dividing net loss attributable to the Company as adjusted for the effect of dilutive ordinary equivalent shares, if any, by the weighted average number of ordinary and dilutive ordinary equivalent shares outstanding during the period. Share options with performance conditions are considered contingently issuable shares and are only included in the computation of diluted loss per share to the extent that the performance conditions are met such that the share options are exercisable at the end of the reporting period, assuming it was the end of the contingency period. Ordinary equivalent shares consist of the ordinary shares issuable upon the conversion of the share options, using the treasury stock method. Ordinary equivalent shares are excluded from the computation of diluted per share if their effects would be anti-dilutive.

Income taxes

The Group follows the liability method of accounting for income taxes in accordance with ASC 740, Income Taxes (“ASC 740”). Under this method, deferred tax assets and liabilities are determined based on the difference between the financial reporting and tax bases of assets and liabilities using enacted tax rates that will be in effect in the period in which the differences are expected to reverse. The Group records a valuation allowance to offset deferred tax assets if based on the weight of available evidence, it is more-likely-than-not that some portion, or all, of the deferred tax assets will not be realized. The effect on deferred taxes of a change in tax rate is recognized in tax expense in the period that includes the enactment date of the change in tax rate.

The Group accounted for uncertainties in income taxes in accordance with ASC 740. Interest and penalties arising from underpayment of income taxes shall be computed in accordance with the related PRC tax law. The amount of interest expense is computed by applying the applicable statutory rate of interest to the difference between the tax position recognized and the amount previously taken or expected to be taken in a tax return. Interest and penalties recognized in accordance with ASC 740 are classified in the consolidated statements of comprehensive loss as income tax expense.

In accordance with the provisions of ASC 740, the Group recognizes in its consolidated financial statements the impact of a tax position if a tax return position or future tax position is “more likely than not” to prevail based on the facts and technical merits of the position. Tax positions that meet the “more likely than not” recognition threshold are measured at the largest amount of tax benefit that has a greater than fifty percent likelihood of being realized upon settlement. The Group’s estimated liability for unrecognized tax benefits, if any, will be recorded in the “other non-current liabilities” in the accompanying consolidated financial statements is periodically assessed for adequacy and may be affected by changing interpretations of laws, rulings by tax authorities, changes and/or developments with respect to tax audits, and expiration of the statute of limitations. The actual benefits ultimately realized may differ from the Group’s estimates. As each audit is concluded, adjustments, if any, are recorded in the Group’s consolidated financial statements. Additionally, in future periods, changes in facts, circumstances, and new information may require the Group to adjust the recognition and measurement estimates with regard to individual tax positions. Changes in recognition and measurement estimates are recognized in the period in which the changes occur.

Concentration of risks

Concentration of credit risk

Assets that potentially subject the Group to significant concentration of credit risk primarily consist of cash and cash equivalents, restricted cash, accounts receivable, contingent receivable and amounts due from related parties. The Group expects that there is no significant credit risk associated with cash and cash equivalents and restricted cash, which were held by reputable financial institutions in the jurisdictions where the Company, its subsidiaries, and the VIEs are located. The Group believes that it is not exposed to unusual risks as these financial institutions have high credit quality. The risk with respect to the contingent receivable is mitigated by the ongoing assessment of the counterparty’s credit quality by reference to the counterparty’s default history. Accounts receivable and amounts due from related parties are typically unsecured and are derived from revenues earned from customers. The risk is mitigated by credit evaluations the Group performs on its customers and its ongoing monitoring process of outstanding balances. As of December 31, 2019 and 2020, the Group had two and one customers with a receivable balance exceeding 10% of the total accounts receivable balance, respectively. The risk with respect to accounts receivable is mitigated by credit evaluations the Group performs on its customers and its ongoing monitoring process of outstanding balances.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Concentration of risks (Continued)

Business, customer, political, social and economic risks

The Group participates in a dynamic and competitive high technology industry and believes that changes in any of the following areas could have a material adverse effect on the Group’s future financial position, results of operations or cash flows: changes in the overall demand for services; competitive pressures due to existing competitors; and new trends in new technologies and industry standards; control of telecommunication infrastructures by local regulators and industry standards; changes in certain strategic relationships or customer relationships; regulatory considerations; and risks associated with the Group’s ability to attract and retain employees necessary to support its growth. The Group’s operations could be adversely affected by significant political, economic and social uncertainties in the PRC.

Two customers accounted for 32.8% and 21.8%, respectively, of total revenues during the year ended December 31, 2018, and 68.2% and 11.1%, respectively, of total revenues during the year ended December 31, 2019. One customer accounted for 81.7% of total revenues during the year ended December 31, 2020.

Interest rate risk

The Group is exposed to interest rate risk on its interest-bearing liabilities. As of December 31, 2020, a hypothetical 1% increase or decrease in annual interest rates of RMB-denominated borrowings, US-denominated borrowings and MYR-denominated borrowings, in aggregate, would increase or decrease total interest expense by approximately RMB38,403 (US$5,886).

Investments in floating rate interest earning instruments carry a degree of interest rate risk. The Group has not been, and do not expect to be, exposed to material interest rate risks relating to such investments.

Currency convertibility risk

The Group transacts a majority of its business in RMB, which is not freely convertible into foreign currencies. On January 1, 1994, the PRC government abolished the dual rate system and introduced a single rate of exchange as quoted daily by the PBOC. However, the unification of the exchange rates does not imply that the RMB may be readily convertible into US$ or other foreign currencies. All foreign exchange transactions continue to take place either through the PBOC or other banks authorized to buy and sell foreign currencies at the exchange rates quoted by the PBOC. Approval of foreign currency payments by the PBOC or other institutions requires submitting a payment application form together with suppliers’ invoices, shipping documents and signed contracts. Additionally, the value of the RMB is subject to changes in central government policies and international economic and political developments affecting supply and demand in the PRC foreign exchange trading system market.

Foreign currency exchange rate risk

From July 21, 2005, the RMB is permitted to fluctuate within a narrow and managed band against a basket of certain foreign currencies. For RMB against U.S. dollar, there was a depreciation and an appreciation of approximately 1.3% and 6.3% during the years ended December 31, 2019 and 2020, respectively. It is difficult to predict how market forces or PRC or U.S. government policy may impact the exchange rate between the RMB and the U.S. dollar in the future. To the extent that the Group needs to convert U.S. dollar into RMB for capital expenditures and working capital and other business purposes, appreciation of RMB against U.S. dollar would have an adverse effect on the RMB amount the Group would receive from the conversion. Conversely, if the Group decides to convert RMB into U.S. dollar for the purpose of making payments for dividends on ordinary shares, strategic acquisitions or investments or other business purposes, appreciation of U.S. dollar against RMB would have a negative effect on the U.S. dollar amount available to the Group. In addition, a significant depreciation of the RMB against the U.S. dollar may significantly reduce the U.S. dollar equivalent of the Group’s earnings or losses.

Recent accounting pronouncements

The Group is an emerging growth company (“EGC”) as defined by the Jumpstart Our Business Startups Act (“JOBS Act”). The JOBS Act provides that an EGC can take advantage of extended transition periods for complying with new or revised accounting standards. This allows an EGC to delay adoption of certain accounting standards until those standards would otherwise apply to private companies. The Group elected to take advantage of the extended transition periods. However, this election will not apply should the Group cease to be classified as an EGC.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 changes the impairment model for most financial assets and certain other instruments. The standard will replace the “incurred loss” approach with an “expected loss” model for instruments measured at amortized cost. For available-for-sale debt securities, entities will be required to record allowances rather than reduce the carrying amount, as they do today under the other-than-temporary impairment model. The amendments in ASU 2016-13 are effective for fiscal years beginning after December 15, 2020, including interim periods within fiscal years beginning after December 15, 2021. In October 2019, the FASB issued ASU No. 2019-10 (ASU 2019-10), Financial Instruments—Credit Losses, which amends the effective date for Credit Losses as follows. Public business entities that meet the definition of an SEC filer, excluding entities eligible to be SRCs as defined by the SEC, for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. All other entities for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. The Group is in the process of evaluating the impact of adoption of this guidance on its consolidated financial statements.

Revenue

12 Months Ended

Dec. 31, 2020

Revenue From Contract With Customer [Abstract]

REVENUE

3. REVENUE

The following table presents the Group’s revenues from contracts with customers disaggregated by material revenue category:

	For the year ended December 31,
	2018		2019		2020		2020
	RMB		RMB		RMB		US$
Colocation services recognized over time		—		678,348		1,701,911		260,829
Colocation rental recognized over time		93,423		128,870		124,991		19,156
Others recognized over time		5,061		45,792		4,175		640
		98,484		853,010		1,831,077		280,625

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

+ Details

Lease

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

LEASE

4. LEASE

Lessee Accounting

The Group’s leases consist of the leasing of building and office space, land, fiber optics and certain equipment. The Group’s land use rights represent land leased for constructing and operating IDC colocation service or rental businesses in the PRC, Malaysia and India. The land use rights represent lease prepayments that are amortized over the term of the land use rights, some of which include options to extend the leases that have not been included in the calculation of the Group’s ROU assets and lease liabilities. Variable lease payments were immaterial for the periods presented.

The components of lease expense were as follows:

	For the year ended December 31,
	2018		2019		2020		2020
	RMB		RMB		RMB		US$
Operating lease cost		2,798		24,224		40,479		6,204
Finance lease cost		6,096		8,931		4,724		724
Short-term lease cost		—		1,661		2,208		338
		8,894		34,816		47,411		7,266

4. LEASE (Continued)

Lessee Accounting (Continued)

Maturities of lease liabilities are as follows:

	Operating Leases						Finance Leases
	RMB			US$			RMB			US$
Year ending December 31, 2021		41,613			6,377			5,466			838
Year ending December 31, 2022		35,712			5,473			5,568			853
Year ending December 31, 2023		28,977			4,441			5,659			867
Year ending December 31, 2024		28,423			4,356			5,774			885
Year ending December 31, 2025 and thereafter		275,242			42,183			178,953			27,426
Total lease payments		409,967			62,830			201,420			30,869
Less imputed interest		(165,531	)		(25,369	)		(136,528	)		(20,924	)
Present value of lease liabilities		244,436			37,461			64,892			9,945

Other supplemental information related to leases is summarized below:

	For the year ended December 31,
	2018		2019		2020		2020
	RMB		RMB		RMB		US$
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows used in operating leases		2,703		21,092		40,275		6,172
Operating cash flows used in finance leases		4,956		6,599		6,008		921
Financing cash flows used in finance leases		75,691		9,230		18,441		2,826
Lease liabilities arising from obtaining right-of-use assets
Operating leases		1,357		13,044		8,091		1,240
Finance leases		62,404		178		708		109

	As at December 31,
	2019			2020
Weighted-average remaining lease term (years)
Operating leases		14.53			13.68
Finance leases		28.24			27.07
Weighted-average discount rate
Operating leases		8.58	%		8.59	%
Finance leases		9.06	%		9.05	%

Lessor Accounting

The Group’s lease contracts in Malaysia do not have the option to extend or terminate the lease or provide the customer the right to purchase the asset at the end of the contract term. Instead, renewal of such contracts requires negotiation of mutually agreed upon terms by both parties. As of December 31, 2020, minimum lease payments expected to be collected were as follows:

	As at December 31, 2020
	RMB		US$
Year ending December 31, 2021		84,313		12,922
Year ending December 31, 2022		73,844		11,317
Year ending December 31, 2023		54,175		8,303
Year ending December 31, 2024		9,587		1,469
Year ending December 31, 2025 and thereafter		33,506		5,135
Total		255,425		39,146

Accounts Receivable

12 Months Ended

Dec. 31, 2020

Accounts Receivable Net [Abstract]

ACCOUNTS RECEIVABLE

5. ACCOUNTS RECEIVABLE

	As at December 31,
	2019			2020			2020
	RMB			RMB			US$
Accounts receivable		309,465			434,720			66,624
Allowance for doubtful accounts		(4,770	)		(12,496	)		(1,915	)
Accounts receivable, net		304,695			422,224			64,709

The movements in the allowance for doubtful accounts were as follows:

	2019			2020		2020
	RMB			RMB		US$
Balance at beginning of the year		98			4,770		731
Provisions		4,710			7,726		1,184
Write-offs		(38	)		—		—
Balance at end of the year		4,770			12,496		1,915

Property and Equipment

12 Months Ended

Dec. 31, 2020

Property Plant And Equipment [Abstract]

PROPERTY AND EQUIPMENT

6. PROPERTY AND EQUIPMENT

	As at December 31,
	2019			2020			2020
	RMB			RMB			US$
Buildings		1,190,980			1,909,633			292,664
Data center equipment		2,375,136			3,945,877			604,732
Furniture and office equipment		13,560			11,934			1,829
Computers and network equipment		9,928			16,677			2,556
Motor vehicles		3,873			6,868			1,053
Purchased software		3,608			6,984			1,070
Leasehold improvements		32,202			36,358			5,572
Construction in progress		1,111,263			1,196,551			183,379
		4,740,550			7,130,882			1,092,855
Less: accumulated depreciation		(335,963	)		(707,052	)		(108,360	)
Property and equipment, net		4,404,587			6,423,830			984,495

Depreciation expense for the years ended December 31, 2018, 2019 and 2020 was RMB83,910, RMB208,415 and RMB369,686 (US$56,657), respectively.

Intangible Assets

12 Months Ended

Dec. 31, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS

7. INTANGIBLE ASSETS

	As at December 31,
	2019			2020			2020
	RMB			RMB			US$
Acquired customer relationships		399,255			397,979			60,993
Acquired license		—			2,556			392
Less: accumulated amortization		(38,506	)		(80,236	)		(12,297	)
Intangible assets, net		360,749			320,299			49,088

The Group recorded amortization expense of RMB4,721, RMB32,760 and RMB42,292 (US$6,482) for the years ended 2018, 2019 and 2020, respectively. As of December 31, 2020, estimated amortization expense of the existing intangible assets for each of the next five years is RMB42,405, RMB42,405, RMB39,592, RMB37,740 and RMB37,247, respectively.

Goodwill

12 Months Ended

Dec. 31, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

GOODWILL

8. GOODWILL

	Stack Group
Balance as of January 1, 2019		—
Goodwill acquired (Note 16)		466,320
Balance as of December 31, 2019		466,320
Goodwill acquired (Note 16)		6,563
Balance as of December 31, 2020		472,883
Balance as of December 31, 2020 (US$)		72,472

For the year ended December 31, 2018, the costs of integrating the business of Bridge Group exceeded the benefits of the acquisition due to stiff competition during the year ended December 31, 2018, therefore, the Group applied the one-step quantitative test and fully impaired the goodwill. The fair value of the reporting unit was determined using the discounted cash flow (“DCF”) method.

For the years ended December 31, 2019 and 2020, the Group performed a qualitative assessment based on the requirements of ASC 350-20. The Group evaluated all relevant factors including, but not limited to, macroeconomic conditions, industry and market conditions and financial performance. The Group weighed all factors in their entirety and concluded that it was not more-likely-than-not the fair value was less than the carrying amount of the reporting unit, and further impairment testing on goodwill was unnecessary.

Accrued Expenses and Other Current Liabilities

12 Months Ended

Dec. 31, 2020

Accounts Payable And Accrued Liabilities Current [Abstract]

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

9. ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

	As at December 31,
	2019		2020		2020
	RMB		RMB		US$
Payroll payable		25,762		48,339		7,408
Interest payable		8,472		14,639		2,244
Deferred government grants		4,092		8,629		1,322
Other tax and surcharges payable		23,510		28,904		4,430
Accrued expenses		52,485		52,768		8,087
Others		15,351		58,270		8,930
		129,672		211,549		32,421

Bank Loans

12 Months Ended

Dec. 31, 2020

Secured Longterm Debt Current And Noncurrent [Abstract]

BANK LOANS

10. BANK LOANS

The Group’s borrowings consisted of the following:

	As at December 31,
	2019		2020		2020
	RMB		RMB		US$
Secured short-term bank loan		15,000		66,135		10,136
Secured long-term bank loan		2,740,501		4,122,898		631,861
		2,755,501		4,189,033		641,997

10. BANK LOANS (Continued)

The Group entered into loan agreements with various financial institutions for data center project development and working capital purpose with terms ranging from 1 to 7 years.

As of December 31, 2019, the Group had total financing credit facilities of RMB1,734,000, US$175,000 and MYR248,000 from various financial institutions, of which the unused amount was RMB184,349, US$50,000 and MYR nil, respectively.

As of December 31, 2020, the Group had total financing credit facilities of RMB2,700,000, US$265,000 and MYR248,000 from various financial institutions, of which the unused amount was RMB128,911, US$30,000 and MYR nil, respectively.

As of December 31, 2020, certain bank borrowings denominated in RMB are secured by certain subsidiaries’ cash of RMB41,000, and accounts receivable, property and equipment and land use rights with net book value of RMB277,992, RMB2,023,663, and RMB109,551 respectively. One loan facility amounted to US$40,000 is guaranteed by a standby letter of credit of US$50,000. Others are guaranteed by designated subsidiaries of the Group or secured by property, assets, deposits and shares of designated subsidiaries.

The weighted average interest rate on short-term bank loan as of December 31, 2019 and 2020 was 5.66% and 7.00%, respectively. The weighted average interest rate on long-term bank loans as of December 31, 2019 and 2020 was 8.36% and 7.87%, respectively. Management assessed that there were no breach of loan covenants for all its bank borrowings as of December 31, 2019 and 2020.

On April 30, 2019, the Group terminated a long-term loan facility and repaid in full the outstanding indebtedness and accrued interest amounting to RMB456,660 and RMB732, respectively. The Group accounted for this termination as a debt extinguishment pursuant to ASC 470-50, Debt—Modifications and Exchanges (“ASC 470-50”) and recorded an extinguishment loss of RMB4,567 within “Others, net” in the consolidated statements of comprehensive loss.

As of December 31, 2020, the loan principal will be due according to the following schedule:

	RMB		US$
2021		296,913		45,504
2022		1,850,212		283,557
2023		489,116		74,960
2024		786,924		120,601
2025 and thereafter		953,623		146,149
		4,376,788		670,771

Taxation

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

TAXATION

11. TAXATION

Enterprise income tax

Under the current laws of the Cayman Islands, the Company and certain subsidiaries incorporated in the Cayman Islands are not subject to tax on income or capital gains.

The Group’s PRC entities are subject to the statutory income tax rate of 25%, in accordance with the Enterprise Income Tax law (the “EIT Law”), which was effective since January 1, 2008. Chindata (Hebei) Co., Ltd. being qualified as a High New Technology Enterprise (“HNTE”) is entitled to the preferential income tax rate of 15% for three years from 2018 to 2020.

Dividends, interests, rent or royalties payable by the Group’s PRC entities, to non-PRC resident enterprises, and proceeds from any such non-resident enterprise investor’s disposition of assets (after deducting the net value of such assets) shall be subject to 10% EIT, namely withholding tax, unless the respective non-PRC resident enterprise’s jurisdiction of incorporation has a tax treaty or arrangements with China that provides for a reduced withholding tax rate or an exemption from withholding tax.

The Group’s Malaysian subsidiaries subject to income tax at the statutory rate of 24% in accordance with Malaysia corporate income tax laws and regulations.

Profit (loss) before income taxes consists of:

	For the year ended December 31,
	2018			2019			2020			2020
	RMB			RMB			RMB			US$
PRC		—			77,079			102,329			15,682
Non-PRC		(140,920	)		(248,522	)		(318,335	)		(48,787	)
		(140,920	)		(171,443	)		(216,006	)		(33,105	)

The current and deferred components of income tax expense (benefit) appearing in the consolidated statements of comprehensive loss are as follows:

	For the year ended December 31,
	2018			2019			2020		2020
	RMB			RMB			RMB		US$
Current income tax		555			631			59,964		9,190
Deferred income tax		(3,314	)		(2,373	)		7,375		1,130
		(2,759	)		(1,742	)		67,339		10,320

11. TAXATION (Continued)

A reconciliation of the differences between the statutory tax rate and the effective tax rate for enterprise income tax is as follows:

	For the year ended December 31,
	2018			2019			2020			2020
	RMB			RMB			RMB			US$
Loss before income tax		(140,920	)		(171,443	)		(216,006	)		(33,105	)
Income tax benefit computed at the PRC statutory tax rate of 25%		(35,230	)		(42,861	)		(54,001	)		(8,276	)
Effect of differing tax rates in different jurisdictions		4,150			23,599			35,228			5,399
Effect of PRC preferential tax rates		—			(3,346	)		(22,350	)		(3,425	)
Research and development super-deduction		—			(4,001	)		(7,557	)		(1,158	)
Effect of tax rate changes on deferred taxes		—			—			5,325			816
Non-deductible expenses and non-taxable income, net*		19,446			384			106,892			16,382
Change in valuation allowance		8,875			24,483			3,802			582
Income tax (benefit) expense		(2,759	)		(1,742	)		67,339			10,320

*	Primarily represents share-based compensation expense, impairment of goodwill, other non-deductible professional expenses, and income from entities not subject to income tax.

Deferred tax

The significant components of the Group’s deferred tax assets and liabilities are as follows:

	As at December 31,
	2019		2020		2020
	RMB		RMB		US$
Deferred tax assets
Tax loss carry forward		67,708		67,873		10,402
Unabsorbed capital allowance		50,475		63,297		9,701
Depreciation and amortization expense		18,809		23,887		3,661
Operating lease		63,823		60,878		9,330
Accrued expenses and others		16,865		35,245		5,402
Less: Valuation allowance*		73,997		71,229		10,916
		143,683		179,951		27,580

	As at December 31,
	2019		2020		2020
	RMB		RMB		US$
Deferred tax liabilities
Property and equipment		173,777		222,489		34,098
Acquisition of intangible assets		89,474		105,805		16,215
Debt issuance cost		15,588		13,243		2,030
Operating lease		63,823		64,358		9,863
Others		8,949		9,698		1,487
		351,611		415,593		63,693
Presentation in the consolidated balance sheets:
Deferred tax assets		3,611		18,789		2,880
Deferred tax liabilities		211,539		254,431		38,993
Net deferred tax liabilities		207,928		235,642		36,113

11. TAXATION (Continued)

Based upon the level of historical taxable income, scheduled reversal of deferred tax liabilities and projections for future taxable income over the periods in which the deferred tax assets are realizable, management recorded full valuation allowance against deferred tax assets of those subsidiaries and VIEs that are in a cumulative loss as of December 31, 2019 and 2020, except for the portion that can be realized by matching reversals of deferred tax liabilities.

As of December 31, 2020, the aggregate undistributed earnings from the Company’s WFOEs as well as VIEs that are available for distribution are RMB414,987 (US$63,600). The Company has considered its operational funding needs, future development initiatives and its dividend distribution plan, and will permanently reinvesting all of its aggregate undistributed earnings. Determination of the amount of unrecognized deferred tax liability related to the earnings that are indefinitely reinvested is not practical.

As of December 31, 2020, the Group had net losses of approximately RMB277,719 (US$42,562) mainly deriving from entities in the PRC and Malaysia. The tax losses in PRC can be carried forward for five years to offset future taxable profit, and the period can be extended to ten years for entities that qualify as HNTE. The tax losses of entities in the PRC will begin to expire in 2023, if not utilized. The tax losses in Malaysia can be carried forward for seven years to offset future taxable profit. The tax losses of entities in Malaysia will begin to expire in 2024, if not utilized.

The Group evaluated its income tax uncertainty under ASC 740. ASC 740 clarifies the accounting for uncertainty in income taxes by prescribing the recognition threshold a tax position is required to meet before being recognized in the financial statements. The Group elects to classify interest and penalties related to an uncertain tax position, if and when required, as part of income tax expense in the consolidated statements of comprehensive income(loss). As of and for the years ended December 31, 2018, 2019 and 2020, there were no significant impact from tax uncertainties on the Group’s financial position and result of operations. The Group does not expect the amount of unrecognized tax benefits would increase significantly in the next 12 months.

In general, the tax authorities have five to seven years to conduct examinations of the tax filings of the Group’s subsidiaries. Accordingly, the subsidiaries’ tax years of 2015 through 2020 remain open to examination by the respective tax authorities.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References + Details

Share-Based Payments

12 Months Ended

Dec. 31, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

SHARE-BASED PAYMENTS

12. SHARE-BASED PAYMENTS

2019 Plan

In December 2019, BCPE Stack ESOP Holdco Limited (“ESOP Holdco”, a shareholder of the Company) approved a share option plan (“2019 Plan”) with a contractual term of ten years. On January 8, 2020, options for the purchase of 17,633,120 ESOP Holdco Class B shares (“Class B Options”) were granted to certain employees of the Group. These options are accounted for as equity awards and contain both service and performance vesting conditions. 60% of the options granted will vest in three or four equal installments over a three to four year service period while the remaining 40% of the options will vest in two equal installments of 20% each if prespecified performance targets related to the return on the Company’s ordinary shares are achieved. The corresponding Class B shares of the vested option can be exchanged for the Company’s ordinary shares on a one-for-one basis at any time after completion of the IPO. As of December 31, 2020, no ESOP Holdco Class B shares were exchanged for the Company’s ordinary shares.

Pursuant to the terms and conditions of the 2019 Plan, grantees may early exercise all or a portion of the Class B Options granted prior to the completion of an IPO, however, such ESOP Holdco Class B shares issued upon exercise or the underlying ordinary shares of the Company exchangeable for after IPO still remain subject to the original service and performance vesting conditions. On April 13, 2020, all of the 17,633,120 Class B Options were early exercised into the corresponding ESOP Holdco Class B shares. The Company considered the rights and obligations of the awards under this arrangement and concluded that the early exercise of the options was not considered substantive for accounting purposes in accordance with ASC 718-10-55-31.

A portion of the Class B options with service conditions granted under 2019 Plan are subject to accelerated vesting upon listing of the Company’s equity securities on the stock exchange. On September 30, 2020 (“Listing Date”), the Company’s ADSs commenced trading on the NASDAQ, and share-based compensation expenses of RMB27,580 (US$4,227) were immediately recognized for 3,808,818 ESOP Holdco Class B shares with vesting accelerated.

12. SHARE-BASED PAYMENTS (Continued)

A summary of the activity is stated below:

	Number of share options/ESOP Holdco Class B shares			Weighted average grant date fair value
				US$
Awarded and unvested as of December 31, 2019		—		n/a
Granted		17,633,120			1.73
Vested		(7,789,995	)		1.79
Forfeited		—		n/a
Awarded and unvested as of December 31, 2020		9,843,125			1.68
Expected to vest as of December 31, 2020		9,843,125			1.68

The weighted-average exercise price for granted share options during the year ended December 31, 2020 was US$0.73.

2020 Plan

In May 2020, the Company’s Board of Directors approved a share option plan (“2020 Plan”) with a contractual term of ten years. The maximum aggregate number of ordinary shares that are authorized to be issued under the 2020 Plan is 5,667,164. On May 29, 2020, 5,667,164 share options were granted to an employee of the Group. These awards are accounted for as equity awards and contain both service and performance vesting conditions. 50% of the award granted will vest in four equal installments over a four year service period while the remaining 50% of the awards will vest in two equal installments of 25% each if prespecified performance targets related to the return of the Company’s ordinary shares are achieved.

In September 2020, the Company’s Board of Directors approved to increase maximum aggregate number of ordinary shares that are authorized to be issued under the 2020 Plan to 11,334,328. 5,666,345 share options with service and/or performance vesting conditions were then granted to certain employees of the Group. These awards are accounted for as equity awards. Pursuant to the option award agreement, a portion of the share options with service conditions are subject to accelerated vesting upon listing of the Company’s equity securities on the stock exchange. Share-based compensation expenses of RMB21,914 (US$3,358) were immediately recognized for 1,125,600 share options with vesting accelerated on the Listing Date.

In October 2020, 2,805,000 share options were granted to certain employees of the Group. These awards are accounted for as equity awards and contain service conditions. Pursuant to the option award agreement, these share options granted will become vested over a service period of four years. In December 2020, the Company’s Board of Directors approved to increase maximum aggregate number of ordinary shares that are authorized to be issued under the 2020 Plan to 22,291,218.

A summary of the activity under 2020 Plan is stated below:

	Number of share options			Weighted average grant date fair value
				US$
Awarded and unvested as of December 31, 2019		—		n/a
Granted		14,138,509			5.43
Exercised*		(5,667,164	)		3.55
Forfeited		(2,000	)		4.61
Awarded and unvested as of December 31, 2020		8,469,345			6.68
Expected to vest as of December 31, 2020		8,469,345			6.68
Exercisable as of December 31, 2020		1,696,614			4.63

12. SHARE-BASED PAYMENTS (Continued)

On August 26, 2020, 5,667,164 share options were early exercised with an exercise cash consideration of US$5,667 received by the Company. The Company’s ordinary shares issued for the grantee’s early exercise still remain subject to the existing service and performance vesting conditions. The Company has a right (but not the obligation) to repurchase the vested shares at fair market value, and the unvested shares at the lower of fair market value or the option’s exercise price at any time during a six-month period following the grantee’s termination of services. The Company considered the rights and obligations of the options under this arrangement and concluded that the early exercise of the options was not considered substantive for accounting purposes in accordance with ASC 718-10-55-31, and recorded the proceeds received from early exercise as a liability.

The weighted-average exercise price for granted and forfeited share options during the year ended December 31, 2020 was US$1.47 and US$1.00, respectively. The weighted-average exercise price for share options outstanding as of December 31, 2020 was US$1.79. The weighted-average exercise price for share options expected to vest and exercisable as of December 31, 2020 was US$1.79 and US$1.01, respectively.

The aggregate intrinsic value represents the difference between the fair value of the Company`s ordinary share as of December 31, 2020 and the option’s respective exercise price. The aggregate intrinsic value of share options outstanding and currently exercisable as of December 31, 2020 was US$55,150 and US$12,373, respectively. The weighted-average remaining contractual term of share options outstanding and currently exercisable is 9.70 and 9.67 years, respectively.

During the year ended December 31, 2020, share-based compensation of RMB234,291 (US$35,907) recognized for awards granted under 2019 Plan and 2020 Plan pertained only to the awards with service vesting conditions.

As of December 31, 2020, there was US$73,257 of total unrecognized employee share-based compensation expenses related to unvested share-based awards under 2019 Plan and 2020 Plan, which are expected to be recognized over a weighted-average period of 1.63 years. Total unrecognized compensation cost may be adjusted for actual forfeitures occurring in the future.

ISUs

On September 11, 2019, BCPE Bridge Cayman, L.P. (“BCPE Bridge”, a shareholder of the Company) issued 1,000,000 BCPE Bridge Class B Units to Bridge Management, L.P. (“SBC Platform”). To attract and retain key employees, the SBC Platform will grant its incentive units to eligible employees of the Group. Each SBC Platform incentive unit represents one BCPE Bridge Cayman, L.P. Class B Unit (“ISUs”). The ISUs granted are accounted for as equity awards. For ISUs granted during 2019, a portion became vested immediately upon grant, and the remaining portion will vest generally over a service period of one to five years. For ISUs granted during 2020, a portion will vest in three or four equal installments over a three to four year service period, and the remaining portion will vest in two equal installments if prespecified performance targets related to the return on the Company’s ordinary shares are achieved. Pursuant to the ISU agreements, certain ISUs with service vesting conditions are subject to accelerated vesting upon listing of the Company’s equity securities on the stock exchange. Share-based compensation of RMB5,132 (US$787) was immediately recognized for 31,137 ISUs with vesting accelerated on the Listing Date.

On August 18, 2020 (“Modification Date”), in connection with the Company’s Pre-IPO private placements (Note 1), BCPE Bridge sold shares representing 21.81% of its shareholding to new investors, and the cash consideration received will be distributed to the shareholders including the SBC Platform (the “Modification”). As part of the Modification, US$30.5 million equivalent to RMB210,986 will be distributed to ISU holders in lieu of underlying ISUs according to the existing ISU vesting schedule. The Company has concluded that future service from the grantees is required for unvested ISUs. Therefore, as of the Modification Date, under ASC 718 the cash settlement was accounted for as a (i) settlement for vested ISUs with no incremental share-based compensation expenses recognized, and (ii) a modification for unvested ISUs, whereby the cash settlement amount in excess of the corresponding original fair value of cash-settled ISU was recorded on the Modification Date on a pro rata basis for the portion of the lapsed service period and remaining additional share-based compensation will be recognized over the remaining vesting schedule.

In October 2020, the SBC Platform redeemed its 1,000,000 BCPE Bridge Class B Units in exchange for 26,797,650 of the Company’s Class B ordinary shares pursuant to the terms of the original SBC Platform and related ISU agreements.

The Company recognized share-based compensation expenses of nil, RMB63,746 and RMB135,682 (US$20,794) for the years ended December 31, 2018, 2019 and 2020, respectively.

12. SHARE-BASED PAYMENTS (Continued)

A summary of the ISU activities is stated below:

	Number of ISUs			Weighted average grant date fair value
				US$
Awarded and unvested as of December 31, 2019		423,000		17.26
Granted		244,409			127.57
Vested		(121,892	)		71.64
Forfeited		(160,000	)		40.32
Awarded and unvested as of December 31, 2020		385,517			74.78
Expected to vest as of December 31, 2020		385,517			74.78

As of December 31, 2020, there was US$ 22,899 of total unrecognized employee share-based compensation expenses related to unvested ISUs, which are expected to be recognized over a weighted-average period of 1.50 years. Total unrecognized compensation cost may be adjusted for actual forfeitures occurring in the future.

Fair value of share options and ISUs

The fair value of share options was determined using the binomial option valuation model, with the assistance of an independent appraiser. The binomial model requires the input of a few key assumptions. For expected volatility, the Company made reference to historical volatility of several comparable companies. The exercise multiple was estimated as the average ratio of the stock price to the exercise price of when employees would decide to voluntarily exercise their vested options. As the Company did not have sufficient information of past employee exercise history, it considered the statistics on exercise patterns of employees compiled by Huddart and Lang in Huddart, S., and M. Lang. 1996. “Employee Stock Option Exercises: An Empirical Analysis.” Journal of Accounting and Economics, vol. 21, no. 1 (February):5-43, which are widely adopted by valuers as authoritative guidance on expected exercise multiples. The risk-free rate for the period within the contractual life of the options is based on the market yield of U.S. Treasury Bonds in effect at the time of grant. The fair value of the ordinary shares underlying the options, was also determined with the assistance of an independent appraiser, using an income approach (discounted cash flow method).

The assumptions used to estimate the fair value of the share options granted during the year ended December 31, 2020 under 2019 Plan and 2020 Plan are as follows:

		2019 Plan	2020 Plan
Risk-free rate		1.90%	0.57% – 1.90%
Expected volatility range	39.65% – 39.78%		39.65% – 40.53%
Exercise multiple		2.80		2.80
Fair value per ordinary share as at valuation dates		US$2.32	US$4.45 – US$14.00

The fair value of the ISUs is the fair value of BCPE Bridge Cayman, L.P. Class B units at the grant date, which was determined by allocating the BCPE Bridge Cayman, L.P. equity value between the Class A and Class B units based on the predetermined distribution rate.

12. SHARE-BASED PAYMENTS (Continued)

A summary of share-based compensation expenses recognized in income and capitalized as part of the cost of assets for the years ended December 31, 2018, 2019 and 2020 is as follows:

	2018		2019		2020		2020
	RMB		RMB		RMB		US$
Cost of revenue		—		—		32,990		5,056
Selling and marketing		—		—		21,691		3,324
General and administrative		—		63,746		295,165		45,236
Construction in progress		—		—		20,127		3,085
Total share-based compensation expenses		—		63,746		369,973		56,701

Related Party Transactions

12 Months Ended

Dec. 31, 2020

RELATED PARTY TRANSACTIONS

13. RELATED PARTY TRANSACTIONS

a)	Related parties

Affiliate of the Company (collectively hereinafter referred to as “Company Affiliates”)

Wangsu Science and Technology Limited Corporation (“Wangsu”)

Zhangjiakou Qinyun Information Technology Co., Ltd. (“Qinyun”)

Affiliates of ultimate controlling shareholder of the Company (collectively hereinafter referred to as “Affiliates”)

Bain Capital Private Equity Advisors (China) Ltd.

Bain Capital Private Equity, LP

Bain Capital Mauritius

BCPE Bridge Cayman L.P.

BCC Mauritius Holdings PCC

Affiliates of certain shareholders of the Company (collectively hereinafter referred to as “Shareholder Affiliates”)

Abiding Joy HK Limited

Stackdata Joy HK Limited

Datalake HK Limited

b)	The Group had the following related party transactions, except for transactions disclosed in other notes:

	For the year ended December 31,
	2018		2019		2020		2020
	RMB		RMB		RMB		US$
Purchase of services from Wangsu*		—		104,312		83,382		12,779
Net revenue from colocation services provided to Wangsu**		—		95,071		83,054		12,729
Management consulting services provided by Affiliates***		11,300		16,434		59,741		9,156
Management consulting services provided by Shareholder Affiliates***		—		8,438		13,016		1,995
Gain on divestiture of Qinyun and related assets****		—		—		6,562		1,006
		11,300		224,255		245,755		37,665

A portion of the services purchased comprised of certain Colocation Resources purchased from Wangsu, which are not distinct within the context of the Company’s revenue arrangement with Wangsu. Thus, in accordance with ASC 606-10-32-25, the entire consideration for these Colocation Resources (“Consideration Payable”) is accounted for as a reduction of revenue.

Colocation services revenue from Wangsu for the period April 26, 2019 to December 31, 2019 and January 1, 2020 to October 2, 2020 have been presented net of Consideration Payable amounting to RMB70,861 and RMB62,440 (US$9,569), respectively. Wangsu ceased to be a related party of the Company after the completion of IPO.

***	In connection with the IPO, the Company recognized a one-time consulting agreements’ termination expense amounting to RMB50,000 (US$7,663) and RMB11,000 (US$1,686), payable in cash to the Affiliates and the Shareholder Affiliates, respectively.

****

On August 4, 2020, the Group disposed 100% of equity interests of Qinyun for nil consideration as Qinyun was in a net deficit position, of which 99.9% and 0.1% was transferred to the Group’s Chief Executive Officer, Mr. Jing Ju and a third-party individual, respectively. Subsequently, the Group transferred certain assets to Qinyun for cash consideration of RMB64,000, which is recorded in due from related party, as a noncash investing activity in consolidated statements of cash flows. The gain resulting from the divestiture of Qinyun and related assets transfer was RMB6,562 (US$1,006).

c)	The Group had the following related party balances at the end of the year:

13. RELATED PARTY TRANSACTIONS (Continued)

	As at December 31,
	2019		2020		2020
	RMB		RMB		US$
Amounts due from related parties:
Company Affiliates		88,929		64,093		9,823
Amounts due to related parties:
Company Affiliates		29,275		—		—
Affiliates		22,890		490		75
Shareholder Affiliates		8,022		36,978		5,667
		60,187		37,468		5,742

All the balances with related parties as of December 31, 2019 and 2020 were unsecured. All outstanding balances are also repayable on demand unless otherwise disclosed. No allowance for doubtful accounts was recognized for the amount due from related parties for the years ended December 31, 2019 and 2020.

Loss Per Share

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

LOSS PER SHARE

14. LOSS PER SHARE

Basic and diluted loss per share for each of the years presented are calculated as follows:

	For the year ended December 31,
	2018			2019			2020
	Ordinary shares						Class A						Class B
	RMB			RMB			RMB			US$			RMB			US$
Numerator:
Net loss attributable to ordinary shareholders—basic and diluted		(138,161	)		(174,443	)		(105,403	)		(16,154	)		(177,942	)		(27,271	)
Denominator:
Weighted average number of shares outstanding—basic and diluted		97,550,502			397,153,121			228,284,218			228,284,218			385,389,358			385,389,358
		(1.42	)		(0.44	)		(0.46	)		(0.07	)		(0.46	)		(0.07	)

The Company’s ordinary shares held by the SBC Platform after redemption of BCPE Bridge Class B Units and in exchange for such ordinary shares that will be transferred to ISU grantees upon vest are factored in the computation of basic and diluted loss per share in 2020 (Note 12).

Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2020

Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

15. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

	RMB
Balance as of January 1, 2018		12
Foreign currency translation adjustments, net of tax of nil		18,032
Balance as of December 31, 2018		18,044
Foreign currency translation adjustments, net of tax of nil		21,967
Balance as of December 31, 2019		40,011
Foreign currency translation adjustments, net of tax of nil		(212,597	)
Balance as of December 31, 2020		(172,586	)
Balance as of December 31, 2020, in US$		(26,450	)

There have been no reclassifications out of accumulated other comprehensive income (loss) to net loss for the periods presented.

Business Combination

12 Months Ended

Dec. 31, 2020

Business Combinations [Abstract]

BUSINESS COMBINATION

16. BUSINESS COMBINATION

The Reorganization

On April 26, 2019 (the “Acquisition Date”), the Group through its PRC subsidiary acquired 100% of the equity interests in Chindata Xiamen, a PRC company, to further develop the Group’s IDC colocation services. Details of the purchase consideration on the Acquisition Date are as follows:

	RMB
Cash consideration		2,785,820
Contingent receivable		(13,503	)
		2,772,317

Pursuant to the acquisition agreement, the Group has an enforceable right to the return of previously transferred consideration of up to RMB48,000 in aggregate, if certain predetermined performance targets are not achieved by Chindata Xiamen during 2019 and 2020, respectively. The Group determined the fair value of the contingent receivable on the Acquisition Date, and as of December 31, 2019 and December 31, 2020 with the assistance of an independent appraiser. During the years ended December 31, 2019 and 2020, a remeasurement gain of RMB1,127 and RMB7,762 (US$1,190), respectively, was recognized through profit or loss.

The acquisition was accounted for as a business combination. Goodwill recognized represents the expected synergies from integrating Chindata Xiamen’s operations with the Group’s existing IDC colocation services, and is not tax deductible. The purchase price allocation for the acquisition is based on a valuation determined by the Group with the assistance of an independent appraiser. The following table summarizes the fair values of the assets acquired and liabilities assumed on the Acquisition Date:

	RMB
Purchase consideration		2,772,317
Less:
Cash and cash equivalents		892,009
Restricted cash		14,771
Other current assets		304,495
Property and equipment, net		1,591,412
Customer relationships		372,025
Operating lease right-of-use assets		392,286
Other non-current assets		113,038
Other current liabilities		(670,648	)
Deferred tax liabilities		(116,019	)
Other non-current liabilities		(587,372	)
Goodwill		466,320

16. BUSINESS COMBINATION (Continued)

Identifiable intangible assets acquired are customer relationships, which was valued using a relief from royalty approach and has an estimated remaining useful life of approximately 10 years.

The unaudited pro forma information for the years ended December 31, 2018 and 2019 set forth below gives effect to the acquisition as if it had occurred at January 1, 2018. The pro forma results have been calculated after applying the Group’s accounting policies and including adjustments primarily related to the depreciation and amortization of acquired property and equipment and intangible assets, interest expense on the borrowings to fund the acquisition, the elimination of transaction costs that was incurred as a result of the acquisition, the income tax effects and the incremental net income (loss) attributable to the non-controlling interests, as applicable. The pro forma information does not include any impact of transaction synergies and is presented for informational purposes only and is not necessarily indicative of the results of operations that actually would have been occurred had the acquisition been consummated as of that time or that may result in the future:

	For the year ended December 31,
	2018			2019
	RMB (unaudited)			RMB (unaudited)
Pro forma revenue		418,910			1,098,383
Pro forma net loss attributable to Chindata Group Holdings Limited		(202,714	)		(141,745	)

2020 Acquisition

On November 1, 2020(the “2020 Acquisition Date”), the Group completed its acquisition of 100% equity interest of Huailai Huizhi Construction Co., Ltd. (“Huizhi”) for purchase consideration of RMB39,612, to enhance its data center construction expertise to generate cost savings for colocation services.

The acquisition was accounted for as a business combination. Goodwill recognized represents the expected synergies from integrating Huizhi’s operation with the Group’s existing IDC colocation services, and is not tax deductible. The purchase price allocation for the acquisition is based on a valuation determined by the Group with the assistance of an independent appraiser. The following table summarizes the fair values of the assets acquired and liabilities assumed on the 2020 Acquisition Date:

	RMB			US$
Purchase consideration		39,612			6,071
Settlement of accounts payable due to Huizhi		(174,695	)		(26,773	)
Total purchase consideration		(135,083	)		(20,702	)
Less:
Cash and cash equivalents		16,008			2,453
Other current assets		24,085			3,691
Property and equipment, net		641			98
Other non-current assets		1,022			157
Current liabilities		(183,402	)		(28,108	)
Goodwill		6,563			1,007

The actual results of operations after the Acquisition Date and pro-forma results of operations for this acquisition have not been presented because the effects of this acquisition were insignificant after elimination of the transactions between the Group and Huizhi.

Restricted Net Assets

12 Months Ended

Dec. 31, 2020

Disclosure Of Restricted Net Assets [Abstract]

RESTRICTED NET ASSETS

17. RESTRICTED NET ASSETS

The Company’s ability to pay dividends is primarily dependent on the Company receiving distributions of funds from its subsidiaries. Relevant PRC statutory laws and regulations permit payments of dividends by the

Group’s PRC subsidiaries only out of their retained earnings, if any, as determined in accordance with PRC accounting standards and regulations. The results of operations reflected in the consolidated financial statements prepared in accordance with U.S. GAAP differ from those reflected in the statutory financial statements of the Company’s PRC subsidiaries.

In accordance with the Regulations on Enterprises with Foreign Investment of China and their Articles of Association, the Company’s wholly foreign-owned enterprises, being foreign invested enterprise established in the PRC, are required to allocate at least 10% of their after-tax profit determined based on the PRC accounting standards and regulations to the general reserve until the reserve has reached 50% of the relevant subsidiary’s registered capital. Appropriations to the staff welfare and bonus fund are at the discretion of the Company’s wholly foreign-owned enterprises. These reserves can only be used for specific purposes and are not transferable to the Company in the form of loans, advances, or cash dividends.

In accordance with the PRC Company Laws, the VIEs must make appropriations from their annual after-tax profits as reported in their PRC statutory accounts to non-distributable reserve funds, namely statutory reserve and discretionary surplus reserve. The VIEs are required to allocate at least 10% of their after-tax profits to the statutory reserve until such fund has reached 50% of their respective registered capital. Appropriation to discretionary surplus reserve is at the discretion of the VIEs. These reserves can only be used for specific purposes and are not transferable to the Company in the form of loans, advances, or cash dividends.

As of December 31, 2020, the Group’s PRC subsidiaries and VIEs had appropriated RMB82,792 (US$12,688) to their reserves.

Furthermore, registered share capital and capital reserve accounts of the Company’s PRC subsidiaries and the VIEs are also restricted from distribution. As a result, the restrictions amounted to approximately RMB2,594,646 (US$397,647) as of December 31, 2020. Therefore, in accordance with Rules 504 and 4.08(e)(3) of Regulation S-X, the condensed parent company only financial statements are disclosed in Note 21.

Cash transfers from the Company’s PRC subsidiaries to its subsidiaries outside of China are subject to PRC government control of currency conversion. Shortages in the availability of foreign currency may restrict the ability of the PRC subsidiaries and the VIEs to remit sufficient foreign currency to pay dividends or other payments to the Company, or otherwise satisfy their foreign currency denominated obligations.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2020

Commitments And Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

18. COMMITMENTS AND CONTINGENCIES

Capital expenditure commitments

The Group has commitments amounting to RMB681,263 (US$104,408) for the purchase of certain data center equipment and construction in progress as of December 31, 2020, which are scheduled to be paid within one to two years.

Contingencies

In August 2020 (“Termination Date”), Bridge Datacentres (Mumbai) LLP (“Bridge Mumbai”), the Company’s subsidiary in India, exercised its rights under the force majeure clause and terminated its construction contact with Sterling & Wilson Private Limited (“S&W”), the contractor of its data center in India. Pursuant to the termination, S&W made a claim against Bridge Mumbai towards amounts payable for work performed through Termination Date, other costs and losses. In turn, Bridge Mumbai also submitted a claim against S&W towards the refund of cash advance payments previously made, and losses caused by S&W including delay in work performed, defective work, and replacement of contractor. In March 2021, Bridge Mumbai submitted a statement of defense. Based on management’s estimation and legal counsel’s advice, RMB32,558 (US$4,990) has been accrued and recorded in “Others, net” in the consolidated statements of comprehensive loss.

Segment Information

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

SEGMENT INFORMATION

19. SEGMENT INFORMATION

The Group has one segment. Its CODM is the Board of Directors, who makes operating decisions, assesses performance and allocates resources on a consolidated basis.

Net revenues by geographic area are based upon the location of the customers. Total net revenues by geographic area are presented as follows:

	For the year ended December 31,
	2018		2019		2020		2020
	RMB		RMB		RMB		US$
PRC		—		712,115		1,706,086		261,469
Malaysia		98,484		140,895		124,991		19,156
		98,484		853,010		1,831,077		280,625

Long-lived assets by geographic area are presented as follows:

	As at December 31,
	2019		2020		2020
	RMB		RMB		US$
PRC		3,807,201		6,016,479		922,066
Malaysia		974,353		958,408		146,882
India		208,668		229,241		35,133
		4,990,222		7,204,128		1,104,081

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8657-108599

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-URI http://asc.fasb.org/topic&trid=2134510

+ Details

Condensed Financial Information of the Parent Company

12 Months Ended

Dec. 31, 2020

Condensed Financial Information Of Parent Company Only Disclosure [Abstract]

CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY

20. CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY

Condensed Balance Sheets

	As at December 31,
	2019			2020			2020
	RMB			RMB			US$
ASSETS
Current assets
Cash and cash equivalents		10,482			3,514,736			538,657
Amounts due from subsidiaries of the Group		2,252			2,894			444
Total current assets		12,734			3,517,630			539,101
Non-current assets
Investment in subsidiaries		3,239,690			6,318,785			968,397
Total non-current assets		3,239,690			6,318,785			968,397
Total assets		3,252,424			9,836,415			1,507,498
LIABILITIES AND SHAREHOLDER’S EQUITY
Current liabilities
Amounts due to related parties		15,251			36,978			5,667
Accrued expenses and other payables		—			28,410			4,356
Total current liabilities		15,251			65,388			10,023
Non-current liabilities:
Other non-current liabilities		—			31,559			4,837
Total non-current liabilities		—			31,559			4,837
Total liabilities		15,251			96,947			14,860
Shareholders’ equity
Ordinary shares (par value of US$0.00001 per share, 5,000,000,000 shares authorized; 566,716,480 shares issued and outstanding as of December 31, 2019; 4,500,000,000 Class A ordinary shares authorized, 344,577,783 Class A ordinary shares issued and outstanding, 500,000,000 Class B ordinary shares authorized, 380,214,434 Class B ordinary shares issued and outstanding as of December 31, 2020)		34			46			7
Additional paid-in capital		3,512,291			10,510,516			1,610,807
Statutory reserve		13,908			82,792			12,688
Accumulated other comprehensive income (loss)		40,011			(172,586	)		(26,450	)
Accumulated deficit		(329,071	)		(681,300	)		(104,414	)
Total shareholders’ equity		3,237,173			9,739,468			1,492,638
Total liabilities and shareholders’ equity		3,252,424			9,836,415			1,507,498

20. CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Continued)

Condensed Statements of Comprehensive Loss

	For the year ended December 31,
	2018			2019			2020			2020
	RMB			RMB			RMB			US$
Operating expenses
General and administrative expenses		—			(33,523	)		(53,945	)		(8,267	)
Total operating expenses		—			(33,523	)		(53,945	)		(8,267	)
Operating loss		—			(33,523	)		(53,945	)		(8,267	)
Interest income		—			—			1,854			284
Interest expense		—			47			—			—
Share of losses of subsidiaries and the VIEs		(138,161	)		(140,967	)		(232,287	)		(35,600	)
Foreign currency exchange loss		—			—			(1,193	)		(183	)
Others, net		—			—			2,226			341
Net loss attributable to ordinary shareholders		(138,161	)		(174,443	)		(283,345	)		(43,425	)
Other comprehensive income (foreign currency translation adjustments), net of tax of nil:		18,032			21,967			(212,597	)		(32,582	)
Comprehensive loss		(120,129	)		(152,476	)		(495,942	)		(76,007	)

20. CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Continued)

Condensed Statements of Cash Flows

	For the year ended December 31,
	2018		2019			2020			2020
	RMB		RMB			RMB			US$
Net cash used in operating activities		—		(26,093	)		(22,553	)		(3,456	)
Net cash used in investing activities		—		(601,174	)		(2,893,144	)		(443,394	)
Net cash generated from financing activities		—		637,792			6,683,039			1,024,221
Effect of exchange rate changes on cash and cash equivalents		—		(43	)		(263,088	)		(40,320	)
Net increase in cash and cash equivalents		—		10,482			3,504,254			537,051
Cash and cash equivalents at beginning of the year		—		—			10,482			1,606
Cash and cash equivalents at end of the year		—		10,482			3,514,736			538,657

Basis of presentation

For the presentation of the parent company only condensed financial information, the Company records its investments in subsidiaries and the VIEs under the equity method of accounting as prescribed in ASC 323, Investments—Equity Method and Joint Ventures. Such investments are presented on the condensed balance sheet as “investments in subsidiaries” and the subsidiaries’ and the VIEs’ losses as “share of losses of subsidiaries and the VIEs” on the condensed statements of comprehensive loss. Under the equity method of accounting, the Company adjusted the carrying amount of “investments in subsidiaries” for its share of the subsidiaries’ and the VIEs’ cumulative losses until the investment balance reaches zero and did not provide for additional losses unless the Company has guaranteed obligations of the subsidiaries’ and the VIEs’ or is otherwise committed to provide further financial support.

The subsidiaries did not pay any dividends to the Company for the periods presented.

The Company does not have significant commitments or long-term obligations as of the period end.

The parent company only financial statements should be read in conjunction with the Company’s consolidated financial statements.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Basis of Presentation

The consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (“U.S. GAAP”).

Principles of Consolidation

Use of estimates

Convenience translation

Foreign currency

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Foreign currency

Cash and cash equivalents

Restricted cash

Restricted cash primarily represent cash and cash equivalents, pledged as security for the Group’s bank loans.

Accounts receivable and allowance for doubtful accounts

Capitalized interest

Derivative instruments

Fair value measurements

ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

Level 1 — Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.

Level 2 — Include other inputs that are directly or indirectly observable in the marketplace.

Level 3 — Unobservable inputs which are supported by little or no market activity.

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2019 are summarized below:

	Quoted price in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	RMB		RMB		RMB
Derivative liabilities		—		9,503		—
Contingent receivable (Note 16)		—		—		14,630

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2020 are summarized below:

	Quoted price in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	RMB		RMB		RMB
Derivative liabilities		—		24,794		—
Contingent receivable (Note 16)		—		—		13,609

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Fair value measurements (Continued)

The following table presents a reconciliation of all financial instruments measured at fair value on a recurring basis using Level 3 unobservable inputs:

	Contingent receivable
	RMB
Balance as of December 31, 2018		—
Recognized during the year ended December 31, 2019		13,503
Fair value change		1,127
Balance as of December 31, 2019		14,630
Settlement		(8,783	)
Fair value change		7,762
Balance as of December 31, 2020		13,609
The amount of total gain for the year ended December 31, 2020		7,762
The amount of total gain for the year ended December 31, 2020 (US$)		1,190

The Group did not transfer any assets or liabilities in or out of Level 3 during all periods presented.

Equity method investments

Property and equipment, net

Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets, as follows:

Category		Estimated Useful Life
Buildings		20 to 40 years
Data center equipment		10 to 20 years
Furniture and office equipment		3 to 5 years
Computers and network equipment		5 years
Motor vehicles		5 years
Purchased software		5 years
Leasehold improvements		Lesser of useful life or lease term

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Inventories

Intangible assets, net

Category		Estimated Useful Life
Acquired customer relationships		5 to 10 years
Acquired license		4 years

Impairment of long-lived assets other than goodwill

Segment reporting

Business combinations

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Business combinations (Continued)

Goodwill

Asset retirement costs

Comprehensive loss

Leases

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Leases

Lessee accounting

Lessor accounting

Revenue recognition

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Revenue recognition (Continued)

Colocation services

Colocation rental

Others

Cost of revenues

Research and development expense

Government grants

Share-based compensation

Employee benefit expenses

The Group has no further payment obligations once the contributions have been paid.

Loss per share

Income taxes

Concentration of risks

Concentration of credit risk

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Concentration of risks (Continued)

Business, customer, political, social and economic risks

Interest rate risk

Currency convertibility risk

Foreign currency exchange rate risk

Recent accounting pronouncements

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)

Organization (Tables)

12 Months Ended

Dec. 31, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule of Principal Subsidiaries Variable Interest Entities and Subsidiaries of Variable Interest Entities

As of December 31, 2020, the Company’s principal subsidiaries, variable interest entities, and subsidiaries of the variable interest entities, are as follows:

Name	Date of establishment/ acquisition	Place of establishment	Percentage of equity interest attributable to the Company			Principal activities
Stack Midco Limited	November 27, 2018	Cayman		100	%	Investment holding
Suzhou Stack Data Technology Company Limited (“Suzhou Stack”)*	December 10, 2018	PRC		100	%	Provision of technical and consulting services
Hebei Stack Data Technology Company Limited (“Hebei Stack”)*	July 10, 2019	PRC		100	%	Provision of technical and consulting services
Chindata (Xiamen) Science and Technology Co., Ltd.	April 26, 2019	PRC		100	%	Provision of technical and consulting services
Chindata (Hebei) Co., Ltd.	April 26, 2019	PRC		100	%	Provision of technical and consulting services
Datong Qinhuai Data Company Limited	April 26, 2019	PRC		100	%	Provision of technical and consulting services
Bridge Data Centres Malaysia Sdn Bhd	November 1, 2017	Malaysia		100	%	Provision of IDC colocation rental services
Variable interest entities:
Sitan (Beijing) Data Technology Company Limited (“Beijing Sitan”)	December 19, 2018	PRC	Nil			Provision of IDC colocation services
Hebei Qinshu Information Technology Company Limited (“Hebei Qinshu”)	July 10, 2019	PRC	Nil			Provision of IDC colocation services
Variable interest entities’ subsidiaries:
Chindata (Beijing) Co., Ltd.	April 26, 2019	PRC	Nil			Provision of IDC colocation services
Sidake Hebei Data Technology Company Limited	April 26, 2019	PRC	Nil			Provision of IDC colocation services
Datong Sitan Data Science and Technology Co., Ltd.	April 26, 2019	PRC	Nil			Provision of IDC colocation services
Chindata (Shenzhen) Co., Ltd.	April 26, 2019	PRC	Nil			Provision of IDC colocation services

*	each or collectively referred to as the “WFOE”.

Schedule of Assets Liabilities and Result of Operations and Cash Flow of VIEs

	As at December 31,
	2019		2020		2020
	RMB		RMB		US$
Current assets
Cash and cash equivalents		78,706		251,589		38,558
Accounts receivable, net		281,619		399,451		61,219
Amounts due from subsidiaries of the Group		299,240		229,845		35,225
Value added taxes recoverable		11,911		3,367		516
Amounts due from related parties		88,929		35		5
Prepayments and other current assets		3,591		5,715		876
Total current assets		763,996		890,002		136,399
Non-current assets
Property and equipment, net		70,872		64,727		9,920
Operating lease right-of-use assets		251,193		239,155		36,652
Intangible assets		22,706		20,251		3,104
Amounts due from subsidiaries of the Group		300,000		300,000		45,977
Deferred tax assets		—		10,598		1,624
Other non-current assets		8,175		8,783		1,346
Total non-current assets		652,946		643,514		98,623
Total assets		1,416,942		1,533,516		235,022
Current liabilities
Accounts payable		19,569		31,694		4,857
Income taxes payable		174		1,288		197
Amounts due to subsidiaries of the Group		997,535		1,124,418		172,325
Amounts due to related parties		14,539		—		—
Current portion of operating lease liabilities		37,401		38,054		5,832
Accrued expenses and other current liabilities		35,828		31,231		4,786
Total current liabilities		1,105,046		1,226,685		187,997
Non-current liabilities
Operating lease liabilities		217,321		204,305		31,311
Deferred tax liabilities		5,206		3,131		480
Other non-current liabilities		4,406		4,977		763
Total non-current liabilities		226,933		212,413		32,554
Total liabilities		1,331,979		1,439,098		220,551

	For the year ended December 31,
	2019		2020			2020
	RMB		RMB			US$
Revenue		712,115		1,706,086			261,469
Net income (loss)		29		(52,771	)		(8,088	)
Net cash generated from operating activities		80,433		122,772			18,816
Net cash used in investing activities	(14,762)			(12,115	)		(1,857	)

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2019 are summarized below:

	Quoted price in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	RMB		RMB		RMB
Derivative liabilities		—		9,503		—
Contingent receivable (Note 16)		—		—		14,630

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2020 are summarized below:

	Quoted price in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	RMB		RMB		RMB
Derivative liabilities		—		24,794		—
Contingent receivable (Note 16)		—		—		13,609

Schedule of Reconciliation of all financial Instruments Measured at Fair Value on a Recurring Basis Using Level 3 Unobservable Inputs

The following table presents a reconciliation of all financial instruments measured at fair value on a recurring basis using Level 3 unobservable inputs:

	Contingent receivable
	RMB
Balance as of December 31, 2018		—
Recognized during the year ended December 31, 2019		13,503
Fair value change		1,127
Balance as of December 31, 2019		14,630
Settlement		(8,783	)
Fair value change		7,762
Balance as of December 31, 2020		13,609
The amount of total gain for the year ended December 31, 2020		7,762
The amount of total gain for the year ended December 31, 2020 (US$)		1,190

Schedule of Property Plant and Equipment Estimated Useful Lives of Assets

Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets, as follows:

Category		Estimated Useful Life
Buildings		20 to 40 years
Data center equipment		10 to 20 years
Furniture and office equipment		3 to 5 years
Computers and network equipment		5 years
Motor vehicles		5 years
Purchased software		5 years
Leasehold improvements		Lesser of useful life or lease term

Schedule of Estimated Useful Life for Intangible Assets

The estimated useful life for the intangible assets is as follows:

Category		Estimated Useful Life
Acquired customer relationships		5 to 10 years
Acquired license		4 years

Revenue (Tables)

12 Months Ended

Dec. 31, 2020

Revenue From Contract With Customer [Abstract]

Summary of Revenues From Contracts With Customers Disaggregated by Material Revenue Category

The following table presents the Group’s revenues from contracts with customers disaggregated by material revenue category:

	For the year ended December 31,
	2018		2019		2020		2020
	RMB		RMB		RMB		US$
Colocation services recognized over time		—		678,348		1,701,911		260,829
Colocation rental recognized over time		93,423		128,870		124,991		19,156
Others recognized over time		5,061		45,792		4,175		640
		98,484		853,010		1,831,077		280,625

Lease (Tables)

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Summary of Components of Lease Expense

The components of lease expense were as follows:

	For the year ended December 31,
	2018		2019		2020		2020
	RMB		RMB		RMB		US$
Operating lease cost		2,798		24,224		40,479		6,204
Finance lease cost		6,096		8,931		4,724		724
Short-term lease cost		—		1,661		2,208		338
		8,894		34,816		47,411		7,266

4. LEASE (Continued)

Schedule of Maturities of Lease Liabilities

Lessee Accounting (Continued)

Maturities of lease liabilities are as follows:

	Operating Leases						Finance Leases
	RMB			US$			RMB			US$
Year ending December 31, 2021		41,613			6,377			5,466			838
Year ending December 31, 2022		35,712			5,473			5,568			853
Year ending December 31, 2023		28,977			4,441			5,659			867
Year ending December 31, 2024		28,423			4,356			5,774			885
Year ending December 31, 2025 and thereafter		275,242			42,183			178,953			27,426
Total lease payments		409,967			62,830			201,420			30,869
Less imputed interest		(165,531	)		(25,369	)		(136,528	)		(20,924	)
Present value of lease liabilities		244,436			37,461			64,892			9,945

Summary of Other Supplemental Information Related to Leases

Other supplemental information related to leases is summarized below:

	For the year ended December 31,
	2018		2019		2020		2020
	RMB		RMB		RMB		US$
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows used in operating leases		2,703		21,092		40,275		6,172
Operating cash flows used in finance leases		4,956		6,599		6,008		921
Financing cash flows used in finance leases		75,691		9,230		18,441		2,826
Lease liabilities arising from obtaining right-of-use assets
Operating leases		1,357		13,044		8,091		1,240
Finance leases		62,404		178		708		109

	As at December 31,
	2019			2020
Weighted-average remaining lease term (years)
Operating leases		14.53			13.68
Finance leases		28.24			27.07
Weighted-average discount rate
Operating leases		8.58	%		8.59	%
Finance leases		9.06	%		9.05	%

Summary of Minimum Lease Payments Expected to be Collected

As of December 31, 2020, minimum lease payments expected to be collected were as follows:

	As at December 31, 2020
	RMB		US$
Year ending December 31, 2021		84,313		12,922
Year ending December 31, 2022		73,844		11,317
Year ending December 31, 2023		54,175		8,303
Year ending December 31, 2024		9,587		1,469
Year ending December 31, 2025 and thereafter		33,506		5,135
Total		255,425		39,146

Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2020

Accounts Receivable Net [Abstract]

Summary of Accounts Receivable

	As at December 31,
	2019			2020			2020
	RMB			RMB			US$
Accounts receivable		309,465			434,720			66,624
Allowance for doubtful accounts		(4,770	)		(12,496	)		(1,915	)
Accounts receivable, net		304,695			422,224			64,709

Summary of Movements in Allowance for Doubtful Accounts

The movements in the allowance for doubtful accounts were as follows:

	2019			2020		2020
	RMB			RMB		US$
Balance at beginning of the year		98			4,770		731
Provisions		4,710			7,726		1,184
Write-offs		(38	)		—		—
Balance at end of the year		4,770			12,496		1,915

Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property Plant And Equipment [Abstract]

Summary of Property and Equipment

	As at December 31,
	2019			2020			2020
	RMB			RMB			US$
Buildings		1,190,980			1,909,633			292,664
Data center equipment		2,375,136			3,945,877			604,732
Furniture and office equipment		13,560			11,934			1,829
Computers and network equipment		9,928			16,677			2,556
Motor vehicles		3,873			6,868			1,053
Purchased software		3,608			6,984			1,070
Leasehold improvements		32,202			36,358			5,572
Construction in progress		1,111,263			1,196,551			183,379
		4,740,550			7,130,882			1,092,855
Less: accumulated depreciation		(335,963	)		(707,052	)		(108,360	)
Property and equipment, net		4,404,587			6,423,830			984,495

Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

	As at December 31,
	2019			2020			2020
	RMB			RMB			US$
Acquired customer relationships		399,255			397,979			60,993
Acquired license		—			2,556			392
Less: accumulated amortization		(38,506	)		(80,236	)		(12,297	)
Intangible assets, net		360,749			320,299			49,088

Goodwill (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Goodwill

	Stack Group
Balance as of January 1, 2019		—
Goodwill acquired (Note 16)		466,320
Balance as of December 31, 2019		466,320
Goodwill acquired (Note 16)		6,563
Balance as of December 31, 2020		472,883
Balance as of December 31, 2020 (US$)		72,472

Accrued Expenses and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Accounts Payable And Accrued Liabilities Current [Abstract]

Summary of Accrued Expenses and Other Current Liabilities

	As at December 31,
	2019		2020		2020
	RMB		RMB		US$
Payroll payable		25,762		48,339		7,408
Interest payable		8,472		14,639		2,244
Deferred government grants		4,092		8,629		1,322
Other tax and surcharges payable		23,510		28,904		4,430
Accrued expenses		52,485		52,768		8,087
Others		15,351		58,270		8,930
		129,672		211,549		32,421

Bank Loans (Tables)

12 Months Ended

Dec. 31, 2020

Secured Longterm Debt Current And Noncurrent [Abstract]

Summary of Group's Borrowings

The Group’s borrowings consisted of the following:

	As at December 31,
	2019		2020		2020
	RMB		RMB		US$
Secured short-term bank loan		15,000		66,135		10,136
Secured long-term bank loan		2,740,501		4,122,898		631,861
		2,755,501		4,189,033		641,997

Summary of Loan Principal Due

As of December 31, 2020, the loan principal will be due according to the following schedule:

	RMB		US$
2021		296,913		45,504
2022		1,850,212		283,557
2023		489,116		74,960
2024		786,924		120,601
2025 and thereafter		953,623		146,149
		4,376,788		670,771

Taxation (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Summary of Profit (Loss) Before Income Taxes

Profit (loss) before income taxes consists of:

	For the year ended December 31,
	2018			2019			2020			2020
	RMB			RMB			RMB			US$
PRC		—			77,079			102,329			15,682
Non-PRC		(140,920	)		(248,522	)		(318,335	)		(48,787	)
		(140,920	)		(171,443	)		(216,006	)		(33,105	)

Summary of Current and Deferred Components of Income Tax Expense (Benefit)

The current and deferred components of income tax expense (benefit) appearing in the consolidated statements of comprehensive loss are as follows:

	For the year ended December 31,
	2018			2019			2020		2020
	RMB			RMB			RMB		US$
Current income tax		555			631			59,964		9,190
Deferred income tax		(3,314	)		(2,373	)		7,375		1,130
		(2,759	)		(1,742	)		67,339		10,320

Schedule of Reconciliation of Differences Between Statutory Tax Rate and Effective Tax Rate for Enterprise Income Tax

A reconciliation of the differences between the statutory tax rate and the effective tax rate for enterprise income tax is as follows:

	For the year ended December 31,
	2018			2019			2020			2020
	RMB			RMB			RMB			US$
Loss before income tax		(140,920	)		(171,443	)		(216,006	)		(33,105	)
Income tax benefit computed at the PRC statutory tax rate of 25%		(35,230	)		(42,861	)		(54,001	)		(8,276	)
Effect of differing tax rates in different jurisdictions		4,150			23,599			35,228			5,399
Effect of PRC preferential tax rates		—			(3,346	)		(22,350	)		(3,425	)
Research and development super-deduction		—			(4,001	)		(7,557	)		(1,158	)
Effect of tax rate changes on deferred taxes		—			—			5,325			816
Non-deductible expenses and non-taxable income, net*		19,446			384			106,892			16,382
Change in valuation allowance		8,875			24,483			3,802			582
Income tax (benefit) expense		(2,759	)		(1,742	)		67,339			10,320

*	Primarily represents share-based compensation expense, impairment of goodwill, other non-deductible professional expenses, and income from entities not subject to income tax.

Schedule of Significant Components of Deferred Tax Assets and Liabilities

The significant components of the Group’s deferred tax assets and liabilities are as follows:

	As at December 31,
	2019		2020		2020
	RMB		RMB		US$
Deferred tax assets
Tax loss carry forward		67,708		67,873		10,402
Unabsorbed capital allowance		50,475		63,297		9,701
Depreciation and amortization expense		18,809		23,887		3,661
Operating lease		63,823		60,878		9,330
Accrued expenses and others		16,865		35,245		5,402
Less: Valuation allowance*		73,997		71,229		10,916
		143,683		179,951		27,580

	As at December 31,
	2019		2020		2020
	RMB		RMB		US$
Deferred tax liabilities
Property and equipment		173,777		222,489		34,098
Acquisition of intangible assets		89,474		105,805		16,215
Debt issuance cost		15,588		13,243		2,030
Operating lease		63,823		64,358		9,863
Others		8,949		9,698		1,487
		351,611		415,593		63,693
Presentation in the consolidated balance sheets:
Deferred tax assets		3,611		18,789		2,880
Deferred tax liabilities		211,539		254,431		38,993
Net deferred tax liabilities		207,928		235,642		36,113

11. TAXATION (Continued)

Share-Based Payments (Tables)

12 Months Ended

Dec. 31, 2020

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Assumptions Used to Estimate Fair Value of Share Options Granted

The assumptions used to estimate the fair value of the share options granted during the year ended December 31, 2020 under 2019 Plan and 2020 Plan are as follows:

		2019 Plan	2020 Plan
Risk-free rate		1.90%	0.57% – 1.90%
Expected volatility range	39.65% – 39.78%		39.65% – 40.53%
Exercise multiple		2.80		2.80
Fair value per ordinary share as at valuation dates		US$2.32	US$4.45 – US$14.00

Summary of Share-based Compensation Expenses Recognized in Income and Capitalized as Part of the Cost of Assets

A summary of share-based compensation expenses recognized in income and capitalized as part of the cost of assets for the years ended December 31, 2018, 2019 and 2020 is as follows:

	2018		2019		2020		2020
	RMB		RMB		RMB		US$
Cost of revenue		—		—		32,990		5,056
Selling and marketing		—		—		21,691		3,324
General and administrative		—		63,746		295,165		45,236
Construction in progress		—		—		20,127		3,085
Total share-based compensation expenses		—		63,746		369,973		56,701

2019 Plan

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Activity

A summary of the activity is stated below:

	Number of share options/ESOP Holdco Class B shares			Weighted average grant date fair value
				US$
Awarded and unvested as of December 31, 2019		—		n/a
Granted		17,633,120			1.73
Vested		(7,789,995	)		1.79
Forfeited		—		n/a
Awarded and unvested as of December 31, 2020		9,843,125			1.68
Expected to vest as of December 31, 2020		9,843,125			1.68

2020 Plan

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Activity

A summary of the activity under 2020 Plan is stated below:

	Number of share options			Weighted average grant date fair value
				US$
Awarded and unvested as of December 31, 2019		—		n/a
Granted		14,138,509			5.43
Exercised*		(5,667,164	)		3.55
Forfeited		(2,000	)		4.61
Awarded and unvested as of December 31, 2020		8,469,345			6.68
Expected to vest as of December 31, 2020		8,469,345			6.68
Exercisable as of December 31, 2020		1,696,614			4.63

ISUs

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Activity

A summary of the ISU activities is stated below:

	Number of ISUs			Weighted average grant date fair value
				US$
Awarded and unvested as of December 31, 2019		423,000		17.26
Granted		244,409			127.57
Vested		(121,892	)		71.64
Forfeited		(160,000	)		40.32
Awarded and unvested as of December 31, 2020		385,517			74.78
Expected to vest as of December 31, 2020		385,517			74.78

Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2020

Summary of Related Party Transactions

The Group had the following related party transactions, except for transactions disclosed in other notes:

	For the year ended December 31,
	2018		2019		2020		2020
	RMB		RMB		RMB		US$
Purchase of services from Wangsu*		—		104,312		83,382		12,779
Net revenue from colocation services provided to Wangsu**		—		95,071		83,054		12,729
Management consulting services provided by Affiliates***		11,300		16,434		59,741		9,156
Management consulting services provided by Shareholder Affiliates***		—		8,438		13,016		1,995
Gain on divestiture of Qinyun and related assets****		—		—		6,562		1,006
		11,300		224,255		245,755		37,665

***	In connection with the IPO, the Company recognized a one-time consulting agreements’ termination expense amounting to RMB50,000 (US$7,663) and RMB11,000 (US$1,686), payable in cash to the Affiliates and the Shareholder Affiliates, respectively.

****

Summary of Related Party Balances

The Group had the following related party balances at the end of the year:

	As at December 31,
	2019		2020		2020
	RMB		RMB		US$
Amounts due from related parties:
Company Affiliates		88,929		64,093		9,823
Amounts due to related parties:
Company Affiliates		29,275		—		—
Affiliates		22,890		490		75
Shareholder Affiliates		8,022		36,978		5,667
		60,187		37,468		5,742

Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Summary of Basic and Diluted Loss Per Share

Basic and diluted loss per share for each of the years presented are calculated as follows:

	For the year ended December 31,
	2018			2019			2020
	Ordinary shares						Class A						Class B
	RMB			RMB			RMB			US$			RMB			US$
Numerator:
Net loss attributable to ordinary shareholders—basic and diluted		(138,161	)		(174,443	)		(105,403	)		(16,154	)		(177,942	)		(27,271	)
Denominator:
Weighted average number of shares outstanding—basic and diluted		97,550,502			397,153,121			228,284,218			228,284,218			385,389,358			385,389,358
		(1.42	)		(0.44	)		(0.46	)		(0.07	)		(0.46	)		(0.07	)

Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2020

Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]

Summary of Accumulated Other Comprehensive Income (Loss)

	RMB
Balance as of January 1, 2018		12
Foreign currency translation adjustments, net of tax of nil		18,032
Balance as of December 31, 2018		18,044
Foreign currency translation adjustments, net of tax of nil		21,967
Balance as of December 31, 2019		40,011
Foreign currency translation adjustments, net of tax of nil		(212,597	)
Balance as of December 31, 2020		(172,586	)
Balance as of December 31, 2020, in US$		(26,450	)

Business Combination (Tables)

12 Months Ended

Dec. 31, 2020

PRC Subsidiary

Business Acquisition [Line Items]

Summary of Purchase Consideration on Acquisition Date

Details of the purchase consideration on the Acquisition Date are as follows:

	RMB
Cash consideration		2,785,820
Contingent receivable		(13,503	)
		2,772,317

Summary of Fair Value of Assets Acquired and Liabilities Assumed on Acquisition Date

The following table summarizes the fair values of the assets acquired and liabilities assumed on the Acquisition Date:

	RMB
Purchase consideration		2,772,317
Less:
Cash and cash equivalents		892,009
Restricted cash		14,771
Other current assets		304,495
Property and equipment, net		1,591,412
Customer relationships		372,025
Operating lease right-of-use assets		392,286
Other non-current assets		113,038
Other current liabilities		(670,648	)
Deferred tax liabilities		(116,019	)
Other non-current liabilities		(587,372	)
Goodwill		466,320

16. BUSINESS COMBINATION (Continued)

Summary of Proforma Information

The pro forma information does not include any impact of transaction synergies and is presented for informational purposes only and is not necessarily indicative of the results of operations that actually would have been occurred had the acquisition been consummated as of that time or that may result in the future:

	For the year ended December 31,
	2018			2019
	RMB (unaudited)			RMB (unaudited)
Pro forma revenue		418,910			1,098,383
Pro forma net loss attributable to Chindata Group Holdings Limited		(202,714	)		(141,745	)

Huailai Huizhi Construction Co. Ltd.

Business Acquisition [Line Items]

Summary of Fair Value of Assets Acquired and Liabilities Assumed on Acquisition Date

The following table summarizes the fair values of the assets acquired and liabilities assumed on the 2020 Acquisition Date:

	RMB			US$
Purchase consideration		39,612			6,071
Settlement of accounts payable due to Huizhi		(174,695	)		(26,773	)
Total purchase consideration		(135,083	)		(20,702	)
Less:
Cash and cash equivalents		16,008			2,453
Other current assets		24,085			3,691
Property and equipment, net		641			98
Other non-current assets		1,022			157
Current liabilities		(183,402	)		(28,108	)
Goodwill		6,563			1,007

Segment Information (Table)

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Summary of Net Revenues by Geographic Area

Net revenues by geographic area are based upon the location of the customers. Total net revenues by geographic area are presented as follows:

	For the year ended December 31,
	2018		2019		2020		2020
	RMB		RMB		RMB		US$
PRC		—		712,115		1,706,086		261,469
Malaysia		98,484		140,895		124,991		19,156
		98,484		853,010		1,831,077		280,625

Summary of Long-lived Assets by Geographic Area

Long-lived assets by geographic area are presented as follows:

	As at December 31,
	2019		2020		2020
	RMB		RMB		US$
PRC		3,807,201		6,016,479		922,066
Malaysia		974,353		958,408		146,882
India		208,668		229,241		35,133
		4,990,222		7,204,128		1,104,081

Condensed Financial Information of the Parent Company (Tables)

12 Months Ended

Dec. 31, 2020

Condensed Financial Information Of Parent Company Only Disclosure [Abstract]

Condensed Financial Statements

Condensed Balance Sheets

	As at December 31,
	2019			2020			2020
	RMB			RMB			US$
ASSETS
Current assets
Cash and cash equivalents		10,482			3,514,736			538,657
Amounts due from subsidiaries of the Group		2,252			2,894			444
Total current assets		12,734			3,517,630			539,101
Non-current assets
Investment in subsidiaries		3,239,690			6,318,785			968,397
Total non-current assets		3,239,690			6,318,785			968,397
Total assets		3,252,424			9,836,415			1,507,498
LIABILITIES AND SHAREHOLDER’S EQUITY
Current liabilities
Amounts due to related parties		15,251			36,978			5,667
Accrued expenses and other payables		—			28,410			4,356
Total current liabilities		15,251			65,388			10,023
Non-current liabilities:
Other non-current liabilities		—			31,559			4,837
Total non-current liabilities		—			31,559			4,837
Total liabilities		15,251			96,947			14,860
Shareholders’ equity
Ordinary shares (par value of US$0.00001 per share, 5,000,000,000 shares authorized; 566,716,480 shares issued and outstanding as of December 31, 2019; 4,500,000,000 Class A ordinary shares authorized, 344,577,783 Class A ordinary shares issued and outstanding, 500,000,000 Class B ordinary shares authorized, 380,214,434 Class B ordinary shares issued and outstanding as of December 31, 2020)		34			46			7
Additional paid-in capital		3,512,291			10,510,516			1,610,807
Statutory reserve		13,908			82,792			12,688
Accumulated other comprehensive income (loss)		40,011			(172,586	)		(26,450	)
Accumulated deficit		(329,071	)		(681,300	)		(104,414	)
Total shareholders’ equity		3,237,173			9,739,468			1,492,638
Total liabilities and shareholders’ equity		3,252,424			9,836,415			1,507,498

20. CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Continued)

Condensed Statements of Comprehensive Loss

	For the year ended December 31,
	2018			2019			2020			2020
	RMB			RMB			RMB			US$
Operating expenses
General and administrative expenses		—			(33,523	)		(53,945	)		(8,267	)
Total operating expenses		—			(33,523	)		(53,945	)		(8,267	)
Operating loss		—			(33,523	)		(53,945	)		(8,267	)
Interest income		—			—			1,854			284
Interest expense		—			47			—			—
Share of losses of subsidiaries and the VIEs		(138,161	)		(140,967	)		(232,287	)		(35,600	)
Foreign currency exchange loss		—			—			(1,193	)		(183	)
Others, net		—			—			2,226			341
Net loss attributable to ordinary shareholders		(138,161	)		(174,443	)		(283,345	)		(43,425	)
Other comprehensive income (foreign currency translation adjustments), net of tax of nil:		18,032			21,967			(212,597	)		(32,582	)
Comprehensive loss		(120,129	)		(152,476	)		(495,942	)		(76,007	)

20. CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Continued)

Condensed Statements of Cash Flows

	For the year ended December 31,
	2018		2019			2020			2020
	RMB		RMB			RMB			US$
Net cash used in operating activities		—		(26,093	)		(22,553	)		(3,456	)
Net cash used in investing activities		—		(601,174	)		(2,893,144	)		(443,394	)
Net cash generated from financing activities		—		637,792			6,683,039			1,024,221
Effect of exchange rate changes on cash and cash equivalents		—		(43	)		(263,088	)		(40,320	)
Net increase in cash and cash equivalents		—		10,482			3,504,254			537,051
Cash and cash equivalents at beginning of the year		—		—			10,482			1,606
Cash and cash equivalents at end of the year		—		10,482			3,514,736			538,657

Organization - Additional Information (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands				12 Months Ended
	Oct. 02, 2020 CNY (¥)	Oct. 02, 2020 USD ($) $ / shares shares	Apr. 26, 2019 CNY (¥)	Dec. 31, 2020 shares	Dec. 31, 2019 shares	Aug. 18, 2020 $ / shares shares	Jul. 31, 2020 $ / shares shares
Organization [Line Items]
Equity interest			100.00%
Purchase consideration \| ¥			¥ 2,772,317
Number of ordinary shares acquired							36,860,590
Shares price per share \| $ / shares							$ 5.43
Common stock, shares, issued					566,716,480
VIEs
Organization [Line Items]
Percentage of revenue contribution by VIE				93.00%	83.00%
Class A Ordinary Shares
Organization [Line Items]
Common stock, shares, issued				344,577,783
Class B
Organization [Line Items]
Common stock, shares, issued				380,214,434
Pre IPO Private Placements
Organization [Line Items]
Number of ordinary shares acquired						119,796,921
Shares price per share \| $ / shares						$ 5.43
Common stock, shares, issued						9,215,147
Number of shares sold and transferred from existing shareholders						110,581,774
IPO
Organization [Line Items]
Shares price per share \| $ / shares		$ 13.50
Number of ADS offered		40,000,000
IPO \| Class A Ordinary Shares
Organization [Line Items]
Common stock, shares, issued		80,000,000
Conversion of outstanding shares		338,584,043
IPO \| Class B
Organization [Line Items]
Conversion of outstanding shares		386,208,174
Concurrent Private Placement
Organization [Line Items]
Shares price per share \| $ / shares		$ 13.50
Number of ADS offered		10,000,000
Concurrent Private Placement \| Class A Ordinary Shares
Organization [Line Items]
Common stock, shares, issued		20,000,000
Underwriter's Option
Organization [Line Items]
Shares price per share \| $ / shares		$ 13.50
Number of ADS offered		6,000,000
Underwriter's Option \| Class A Ordinary Shares
Organization [Line Items]
Common stock, shares, issued		12,000,000
IPO and Concurrent Private Placement
Organization [Line Items]
Underwriting discount and issuance cost	¥ 4,871,804	$ 746,637

Organization - Schedule of Principal Subsidiaries Variable Interest Entities and Subsidiaries of Variable Interest Entities (Details)	12 Months Ended
	Dec. 31, 2020
Stack Midco Limited \| Cayman
Principal Subsidiaries VIE And Subsidiaries Of VIE [Line Item]
Date of establishment/ acquisition	Nov. 27, 2018
Place of establishment	Cayman
Percentage of equity interest attributable to the Company	100.00%
Principal activities	Investment holding
Suzhou Stack \| PRC
Principal Subsidiaries VIE And Subsidiaries Of VIE [Line Item]
Date of establishment/ acquisition	Dec. 10, 2018
Place of establishment	PRC
Percentage of equity interest attributable to the Company	100.00%
Principal activities	Provision of technical and consulting services
Hebei Stack \| PRC
Principal Subsidiaries VIE And Subsidiaries Of VIE [Line Item]
Date of establishment/ acquisition	Jul. 10, 2019
Place of establishment	PRC
Percentage of equity interest attributable to the Company	100.00%
Principal activities	Provision of technical and consulting services
Chindata (Xiamen) Science and Technology Co., Ltd \| PRC
Principal Subsidiaries VIE And Subsidiaries Of VIE [Line Item]
Date of establishment/ acquisition	Apr. 26, 2019
Place of establishment	PRC
Percentage of equity interest attributable to the Company	100.00%
Principal activities	Provision of technical and consulting services
Chindata (Hebei) Co Ltd \| PRC
Principal Subsidiaries VIE And Subsidiaries Of VIE [Line Item]
Date of establishment/ acquisition	Apr. 26, 2019
Place of establishment	PRC
Percentage of equity interest attributable to the Company	100.00%
Principal activities	Provision of technical and consulting services
Datong Qinhuai Data Company Limited \| PRC
Principal Subsidiaries VIE And Subsidiaries Of VIE [Line Item]
Date of establishment/ acquisition	Apr. 26, 2019
Place of establishment	PRC
Percentage of equity interest attributable to the Company	100.00%
Principal activities	Provision of technical and consulting services
Bridge Data Centres Malaysia Sdn Bhd \| Malaysia
Principal Subsidiaries VIE And Subsidiaries Of VIE [Line Item]
Date of establishment/ acquisition	Nov. 01, 2017
Place of establishment	Malaysia
Percentage of equity interest attributable to the Company	100.00%
Principal activities	Provision of IDC colocation rental services
Variable Interest Entities \| Beijing Sitan \| PRC
Principal Subsidiaries VIE And Subsidiaries Of VIE [Line Item]
Date of establishment/ acquisition	Dec. 19, 2018
Place of establishment	PRC
Principal activities	Provision of IDC colocation services
Variable Interest Entities \| Hebei Qinshu \| PRC
Principal Subsidiaries VIE And Subsidiaries Of VIE [Line Item]
Date of establishment/ acquisition	Jul. 10, 2019
Place of establishment	PRC
Principal activities	Provision of IDC colocation services
Variable Interest Entities’ Subsidiaries \| Chindata Beijing Co Ltd \| PRC
Principal Subsidiaries VIE And Subsidiaries Of VIE [Line Item]
Date of establishment/ acquisition	Apr. 26, 2019
Place of establishment	PRC
Principal activities	Provision of IDC colocation services
Variable Interest Entities’ Subsidiaries \| Sidake Hebei Data Technology Company Limited \| PRC
Principal Subsidiaries VIE And Subsidiaries Of VIE [Line Item]
Date of establishment/ acquisition	Apr. 26, 2019
Place of establishment	PRC
Principal activities	Provision of IDC colocation services
Variable Interest Entities’ Subsidiaries \| Datong Sitan Data Science and Technology Co Ltd \| PRC
Principal Subsidiaries VIE And Subsidiaries Of VIE [Line Item]
Date of establishment/ acquisition	Apr. 26, 2019
Place of establishment	PRC
Principal activities	Provision of IDC colocation services
Variable Interest Entities’ Subsidiaries \| Shenzhen \| PRC
Principal Subsidiaries VIE And Subsidiaries Of VIE [Line Item]
Date of establishment/ acquisition	Apr. 26, 2019
Place of establishment	PRC
Principal activities	Provision of IDC colocation services

Organization - Schedule of Assets Liabilities and Result of Operations and Cash Flow of VIEs (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2020 USD ($)
Current assets
Cash and cash equivalents	¥ 6,705,612		¥ 1,038,897	¥ 104,207	$ 1,027,680
Accounts receivable, net	422,224		304,695		64,709
Value added taxes recoverable	182,982		80,715		28,043
Amount due from related parties	64,093		88,929		9,823
Prepayments and other current assets	112,467		45,530		17,234
Total current assets	7,589,976		1,573,131		1,163,213
Non-current assets
Property and equipment, net	6,423,830		4,404,587		984,495
Operating lease right-of-use assets	635,683		430,288		97,423
Intangible assets	320,299		360,749		49,088
Deferred tax assets	18,789		3,611		2,880
Other non-current assets	193,145		62,721		29,600
Total non-current assets	8,669,622		6,198,052		1,328,677
Total assets	16,259,598		7,771,183		2,491,890
Current liabilities
Accounts payable	1,186,030		959,372		181,767
Amounts due to related parties	37,468		60,187		5,742
Current portion of operating lease liabilities	40,131		37,767		6,150
Total current liabilities	1,832,940		1,266,779		280,910
Non-current liabilities
Operating lease liabilities	204,305		217,523		31,311
Deferred tax liabilities	254,431		211,539		38,993
Other non-current liabilities	260,225		78,510		39,881
Total non-current liabilities	4,687,190		3,267,231		718,342
Total liabilities	6,520,130		4,534,010		999,252
Total revenue	1,831,077	$ 280,625	853,010	98,484
Net income (loss)	(283,345)	(43,425)	(169,701)	(138,161)
Net cash generated from operating activities	664,910	101,902	40,167	(25,601)
Net cash used in investing activities	(2,769,269)	(424,409)	(3,520,639)	¥ (1,052,317)
VIEs
Current assets
Cash and cash equivalents	251,589		78,706		38,558
Accounts receivable, net	399,451		281,619		61,219
Amounts due from subsidiaries of the Group	229,845		299,240		35,225
Value added taxes recoverable	3,367		11,911		516
Amount due from related parties	35		88,929		5
Prepayments and other current assets	5,715		3,591		876
Total current assets	890,002		763,996		136,399
Non-current assets
Property and equipment, net	64,727		70,872		9,920
Operating lease right-of-use assets	239,155		251,193		36,652
Intangible assets	20,251		22,706		3,104
Amounts due from subsidiaries of the Group	300,000		300,000		45,977
Deferred tax assets	10,598		0		1,624
Other non-current assets	8,783		8,175		1,346
Total non-current assets	643,514		652,946		98,623
Total assets	1,533,516		1,416,942		235,022
Current liabilities
Accounts payable	31,694		19,569		4,857
Income taxes payable	1,288		174		197
Amounts due to subsidiaries of the Group	1,124,418		997,535		172,325
Amounts due to related parties	0		14,539		0
Current portion of operating lease liabilities	¥ 38,054		¥ 37,401		$ 5,832
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	cd:OperatingLeaseLiabilityCurrentMember		cd:OperatingLeaseLiabilityCurrentMember		cd:OperatingLeaseLiabilityCurrentMember
Accrued expenses and other current liabilities	¥ 31,231		¥ 35,828		$ 4,786
Total current liabilities	1,226,685		1,105,046		187,997
Non-current liabilities
Operating lease liabilities	¥ 204,305		¥ 217,321		$ 31,311
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	cd:OperatingLeaseLiabilityNoncurrentMember		cd:OperatingLeaseLiabilityNoncurrentMember		cd:OperatingLeaseLiabilityNoncurrentMember
Deferred tax liabilities	¥ 3,131		¥ 5,206		$ 480
Other non-current liabilities	4,977		4,406		763
Total non-current liabilities	212,413		226,933		32,554
Total liabilities	1,439,098		1,331,979		$ 220,551
Total revenue	1,706,086	261,469	712,115
Net income (loss)	(52,771)	(8,088)	29
Net cash generated from operating activities	122,772	18,816	80,433
Net cash used in investing activities	¥ (12,115)	$ (1,857)	¥ (14,762)

Summary of Significant Accounting Policies - Additional Information1 (Details)	Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01
Summary Of Significant Accounting Policies [Line Items]
Revenue, performance obligation percentage	11.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Summary Of Significant Accounting Policies [Line Items]
Revenue, performance obligation percentage	47.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	4 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-01-01
Summary Of Significant Accounting Policies [Line Items]
Revenue, performance obligation percentage	42.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	0 years

Summary of Significant Accounting Policies - Additional Information (Details) RM in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 MYR (RM)	Dec. 31, 2019 MYR (RM)
Summary Of Significant Accounting Policies [Line Items]
Convenience translation rate (USD to RMB)	6.5250				6.5250	6.5250
Interest expenses incurred	¥ 330,573,000	$ 50,663	¥ 120,170,000	¥ 24,344,000
Interest expenses incurred capitalized	92,189,000	$ 14,129	17,880,000	0
Impairment loss	0		0
Inventory write-downs	0		0
Impairment of long-lived assets	0		0
Impairment of goodwill	0		¥ 0	¥ 21,598,000
Revenue, performance obligation	¥ 12,587,598,000				$ 1,929,134
Foreign currency exchange rate depreciation			1.30%
Foreign currency exchange rate appreciation	6.30%	6.30%
RMB US and MYR-Denominated Borrowings \| Interest Rate Risk
Summary Of Significant Accounting Policies [Line Items]
Hypothetical increase or decrease in annual interest rates of denominated borrowings	1.00%	1.00%
Increase or decrease total interest expense	¥ 38,403,000				5,886
Accounts Receivable \| Customer Two
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percent	10.00%	10.00%	10.00%
Accounts Receivable \| Customer One
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percent	10.00%	10.00%	10.00%
Revenue \| Customer Two
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percent			11.10%	21.80%
Revenue \| Customer One
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percent			68.20%	32.80%
Revenue \| Customer Three
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percent	81.70%	81.70%
PRC
Summary Of Significant Accounting Policies [Line Items]
Employee benefit expenses	¥ 18,385,000	$ 2,818	¥ 16,210,000	¥ 0
Malaysia
Summary Of Significant Accounting Policies [Line Items]
Employee benefit expenses	1,049,000	161	1,150,000	1,082,000
Other Noncurrent Liabilities
Summary Of Significant Accounting Policies [Line Items]
Asset retirement obligations	3,993,000		3,885,000		612
ASC 815
Summary Of Significant Accounting Policies [Line Items]
Notional amount of derivative contracts	110,000,000				$ 160,000	RM 644,654	RM 644,654
Gain (loss) recognized	¥ (20,479,000)	$ (3,139)	¥ (12,316,000)	¥ 2,643,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Revenue performance obligation period	1 year	1 year
Maximum
Summary Of Significant Accounting Policies [Line Items]
Revenue performance obligation period	10 years	10 years

Summary of Significant Accounting Policies - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring - CNY (¥) ¥ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Significant Other Observable Inputs (Level 2)
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	¥ 24,794	¥ 9,503
Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]
Contingent receivable (Note 16)	¥ 13,609	¥ 14,630

Summary of Significant Accounting Policies - Schedule of Reconciliation of all financial Instruments Measured at Fair Value on a Recurring Basis Using Level 3 Unobservable Inputs (Details) - Fair Value, Recurring - Significant Unobservable Inputs (Level 3) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	¥ 14,630		¥ 0
Recognized during the year ended			13,503
Settlement	(8,783)
Fair value change	7,762		1,127
Year end balance	13,609		¥ 14,630
The amount of total gain for the year ended December 31, 2020	¥ 7,762	$ 1,190

Summary of Significant Accounting Policies - Schedule Schedule of Property Plant and Equipment Estimated Useful Lives of Assets (Details)	12 Months Ended
	Dec. 31, 2020
Buildings \| Minimum
Property Plant And Equipment [Line Items]
Estimated useful lives of the assets	20 years
Buildings \| Maximum
Property Plant And Equipment [Line Items]
Estimated useful lives of the assets	40 years
Data Center Equipment \| Minimum
Property Plant And Equipment [Line Items]
Estimated useful lives of the assets	10 years
Data Center Equipment \| Maximum
Property Plant And Equipment [Line Items]
Estimated useful lives of the assets	20 years
Furniture and Office Equipment \| Minimum
Property Plant And Equipment [Line Items]
Estimated useful lives of the assets	3 years
Furniture and Office Equipment \| Maximum
Property Plant And Equipment [Line Items]
Estimated useful lives of the assets	5 years
Computers and Network Equipment
Property Plant And Equipment [Line Items]
Estimated useful lives of the assets	5 years
Motor Vehicles
Property Plant And Equipment [Line Items]
Estimated useful lives of the assets	5 years
Purchased Software
Property Plant And Equipment [Line Items]
Estimated useful lives of the assets	5 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Estimated useful lives of the assets	Lesser of useful life or lease term

Summary of Significant Accounting Policies - Schedule of Estimated Useful Life for Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2020
Acquired License
Acquired Finite Lived Intangible Assets [Line Items]
Estimated useful life for intangible assets	4 years
Minimum \| Acquired Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Estimated useful life for intangible assets	5 years
Maximum \| Acquired Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Estimated useful life for intangible assets	10 years

Revenue - Summary of Revenues From Contracts With Customers Disaggregated by Material Revenue Category (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Disaggregation Of Revenue [Line Items]
Total revenue	¥ 1,831,077	$ 280,625	¥ 853,010	¥ 98,484
Colocation Services Recognized Over Time
Disaggregation Of Revenue [Line Items]
Total revenue	1,701,911	260,829	678,348	0
Colocation Rental Recognized Over Time
Disaggregation Of Revenue [Line Items]
Total revenue	124,991	19,156	128,870	93,423
Others Recognized Over Time
Disaggregation Of Revenue [Line Items]
Total revenue	¥ 4,175	$ 640	¥ 45,792	¥ 5,061

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

+ Details

Lease - Summary of Components of Lease Expense (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Lease Cost [Abstract]
Operating lease cost	¥ 40,479	$ 6,204	¥ 24,224	¥ 2,798
Finance lease cost	4,724	724	8,931	6,096
Short-term lease cost	2,208	338	1,661	0
Lease expense	¥ 47,411	$ 7,266	¥ 34,816	¥ 8,894

Lease - Schedule of Maturities of Lease Liabilities (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)
Operating Leases
Year ending December 31, 2021	¥ 41,613	$ 6,377
Year ending December 31, 2022	35,712	5,473
Year ending December 31, 2023	28,977	4,441
Year ending December 31, 2024	28,423	4,356
Year ending December 31, 2025 and thereafter	275,242	42,183
Total lease payments	409,967	62,830
Less imputed interest	(165,531)	(25,369)
Present value of lease liabilities	¥ 244,436	$ 37,461
Operating Lease, Liability, Statement of Financial Position [Extensible List]	cd:OperatingLeaseLiabilityMember	cd:OperatingLeaseLiabilityMember
Finance Leases
Year ending December 31, 2021	¥ 5,466	$ 838
Year ending December 31, 2022	5,568	853
Year ending December 31, 2023	5,659	867
Year ending December 31, 2024	5,774	885
Year ending December 31, 2025 and thereafter	178,953	27,426
Total lease payments	201,420	30,869
Less imputed interest	(136,528)	(20,924)
Present value of lease liabilities	¥ 64,892	$ 9,945
Finance Lease, Liability, Statement of Financial Position [Extensible List]	cd:FinanceLeaseLiabilitiesMember	cd:FinanceLeaseLiabilitiesMember

Lease - Summary of Other Supplemental Information Related to Leases (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Leases [Abstract]
Operating cash flows used in operating leases	¥ 40,275	$ 6,172	¥ 21,092	¥ 2,703
Operating cash flows used in finance leases	6,008	921	6,599	4,956
Financing cash flows used in finance leases	18,441	2,826	9,230	75,691
Lease liabilities arising from obtaining right-of-use assets
Operating leases	8,091	1,240	13,044	1,357
Finance leases	¥ 708	$ 109	¥ 178	¥ 62,404
Weighted-average remaining lease term (years)
Operating leases	13 years 8 months 4 days	13 years 8 months 4 days	14 years 6 months 10 days
Finance leases	27 years 25 days	27 years 25 days	28 years 2 months 26 days
Weighted-average discount rate
Operating leases	8.59%	8.59%	8.58%
Finance leases	9.05%	9.05%	9.06%

Lease - Summary of Minimum Lease Payments Expected to be Collected (Details) - Dec. 31, 2020 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Leases [Abstract]
Year ending December 31, 2021	¥ 84,313	$ 12,922
Year ending December 31, 2022	73,844	11,317
Year ending December 31, 2023	54,175	8,303
Year ending December 31, 2024	9,587	1,469
Year ending December 31, 2025 and thereafter	33,506	5,135
Total	¥ 255,425	$ 39,146

Accounts Receivable - Summary of Accounts Receivable (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)
Accounts Receivable Net [Abstract]
Accounts receivable	¥ 434,720	$ 66,624	¥ 309,465
Allowance for doubtful accounts	(12,496)	(1,915)	(4,770)	$ (731)	¥ (98)
Accounts receivable, net	¥ 422,224	$ 64,709	¥ 304,695

Accounts Receivable - Summary of Movements in Allowance for Doubtful Accounts (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Allowance For Doubtful Accounts Receivable Rollforward
Balance at beginning of the year	¥ 4,770	$ 731	¥ 98
Provisions	7,726	1,184	4,710
Write-offs			(38)
Balance at end of the year	¥ 12,496	$ 1,915	¥ 4,770

Property and Equipment - Summary of Property and Equipment (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Property Plant And Equipment [Line Items]
Property and equipment, gross	¥ 7,130,882	$ 1,092,855	¥ 4,740,550
Less: accumulated depreciation	(707,052)	(108,360)	(335,963)
Property and equipment, net	6,423,830	984,495	4,404,587
Buildings
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,909,633	292,664	1,190,980
Data Center Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	3,945,877	604,732	2,375,136
Furniture and Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	11,934	1,829	13,560
Computers and Network Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	16,677	2,556	9,928
Motor Vehicles
Property Plant And Equipment [Line Items]
Property and equipment, gross	6,868	1,053	3,873
Purchased Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	6,984	1,070	3,608
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	36,358	5,572	32,202
Construction in Progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	¥ 1,196,551	$ 183,379	¥ 1,111,263

Property and Equipment - Additional Information (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Property Plant And Equipment [Abstract]
Depreciation expense	¥ 369,686	$ 56,657	¥ 208,415	¥ 83,910

Intangible Assets - Schedule of Intangible Assets (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Goodwill And Intangible Assets Disclosure [Abstract]
Acquired customer relationships	¥ 397,979	$ 60,993	¥ 399,255
Acquired license	2,556	392
Less: accumulated amortization	(80,236)	(12,297)	(38,506)
Intangible assets, net	¥ 320,299	$ 49,088	¥ 360,749

Intangible Assets - Additional Information (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense	¥ 42,292	$ 6,482	¥ 32,760	¥ 4,721
Estimated amortization expense, 2021	42,405
Estimated amortization expense, 2022	42,405
Estimated amortization expense, 2023	39,592
Estimated amortization expense, 2024	37,740
Estimated amortization expense, 2025	¥ 37,247

Goodwill - Summary of Goodwill (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Goodwill [Line Items]
Beginning balance	¥ 466,320
Ending balance	472,883	$ 72,472	¥ 466,320
Stack Group
Goodwill [Line Items]
Beginning balance	466,320
Goodwill acquired (Note 16)	6,563		466,320
Ending balance	¥ 472,883	$ 72,472	¥ 466,320

Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Accounts Payable And Accrued Liabilities Current [Abstract]
Payroll payable	¥ 48,339	$ 7,408	¥ 25,762
Interest payable	14,639	2,244	8,472
Deferred government grants	8,629	1,322	4,092
Other tax and surcharges payable	28,904	4,430	23,510
Accrued expenses	52,768	8,087	52,485
Others	58,270	8,930	15,351
Accrued expenses and other current liabilities	¥ 211,549	$ 32,421	¥ 129,672

Bank Loans - Summary of Group's Borrowings (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Secured Longterm Debt Current And Noncurrent [Abstract]
Secured short-term bank loan	¥ 66,135	$ 10,136	¥ 15,000
Secured long-term bank loan	4,122,898	631,861	2,740,501
Bank loan	¥ 4,189,033	$ 641,997	¥ 2,755,501

Bank Loans - Additional Information (Details) $ in Thousands		12 Months Ended
	Apr. 30, 2019 CNY (¥)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 MYR (RM)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 MYR (RM)
Debt Instrument [Line Items]
Financing credit facilities, amount		¥ 2,700,000,000	¥ 1,734,000,000	$ 265,000	RM 248,000	$ 175,000	RM 248,000
Unused loan facilities for bank borrowings		¥ 128,911,000	¥ 184,349,000	$ 30,000	RM 0	$ 50,000	RM 0
Weighted average interest rate on short-term bank loan		7.00%	5.66%	7.00%	7.00%	5.66%	5.66%
Weighted average interest rate on long-term bank loans		7.87%	8.36%	7.87%	7.87%	8.36%	8.36%
Breach of loan		¥ 0	¥ 0
Extinguishment loss recorded	¥ 4,567,000
Indebtedness
Debt Instrument [Line Items]
Repayments of long-term debt	456,660,000
Accrued Interest
Debt Instrument [Line Items]
Repayments of long-term debt	¥ 732,000
Secured Debt \| Bank Borrowings \| Cash
Debt Instrument [Line Items]
Loan facility amount		41,000,000
Secured Debt \| Bank Borrowings \| Accounts Receivable
Debt Instrument [Line Items]
Loan facility amount		277,992,000
Secured Debt \| Bank Borrowings \| Property and Equipment
Debt Instrument [Line Items]
Loan facility amount		2,023,663,000
Secured Debt \| Bank Borrowings \| Land Use Rights
Debt Instrument [Line Items]
Loan facility amount		¥ 109,551,000
Secured Debt \| Standby Letter of Credit \| Bank Borrowings
Debt Instrument [Line Items]
Loan facility amount \| $				$ 50,000
Secured Debt \| Standby Letter of Credit \| Bank Borrowings \| One Loan Facility
Debt Instrument [Line Items]
Financing credit facilities, amount \| $				$ 40,000
Minimum
Debt Instrument [Line Items]
Loan agreements, term		1 year
Maximum
Debt Instrument [Line Items]
Loan agreements, term		7 years

Bank Loans - Summary of Loan Principal Due (Details) - Dec. 31, 2020 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Secured Longterm Debt Current And Noncurrent [Abstract]
2021	¥ 296,913	$ 45,504
2022	1,850,212	283,557
2023	489,116	74,960
2024	786,924	120,601
2025 and thereafter	953,623	146,149
Loan principal due	¥ 4,376,788	$ 670,771

Taxation - Additional Information (Details) $ in Thousands	12 Months Ended
Taxation - Additional Information (Details) $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2020 USD ($)
Tax Credit Carryforward [Line Items]
Statutory income tax rate	25.00%	25.00%	25.00%
Preferential income tax rate	15.00%
Effective period of certificate	3 years
Withholding income tax rate	10.00%
Undistributed earnings	¥ 414,987,000			$ 63,600
Impact from tax uncertainties	¥ 0	¥ 0	¥ 0
Income tax examination, description	In general, the tax authorities have five to seven years to conduct examinations of the tax filings of the Group’s subsidiaries.
Income tax examination years under examination	2015 2016 2017 2018 2019 2020
Earliest Tax Year
Tax Credit Carryforward [Line Items]
Time period that tax authorities could conduct examinations of entity tax filings	5 years
Latest Tax Year
Tax Credit Carryforward [Line Items]
Time period that tax authorities could conduct examinations of entity tax filings	7 years
PRC and Malaysia
Tax Credit Carryforward [Line Items]
Operating loss	¥ 277,719,000			$ 42,562
PRC
Tax Credit Carryforward [Line Items]
Tax losses carry forward duration	5 years
Tax loss carry forward extended duration	10 years
Operating loss carryforwards expiration year	2023
Malaysia
Tax Credit Carryforward [Line Items]
Tax losses carry forward duration	7 years
Operating loss carryforwards expiration year	2024
Malaysia
Tax Credit Carryforward [Line Items]
Statutory income tax rate	24.00%

Taxation - Summary of Profit (Loss) Before Income Taxes (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Income Tax Disclosure [Abstract]
PRC	¥ 102,329	$ 15,682	¥ 77,079
Non-PRC	(318,335)	(48,787)	(248,522)	¥ (140,920)
Loss before income taxes	¥ (216,006)	$ (33,105)	¥ (171,443)	¥ (140,920)

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(10))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(8))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-URI http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(15))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

+ Details

Taxation - Summary of Current and Deferred Components of Income Tax Expense (Benefit) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Income Tax Disclosure [Abstract]
Current income tax	¥ 59,964	$ 9,190	¥ 631	¥ 555
Deferred income tax	7,375	1,130	(2,373)	(3,314)
Income tax expense (benefit)	¥ 67,339	$ 10,320	¥ (1,742)	¥ (2,759)

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Taxation - Schedule of Reconciliation of Differences Between Statutory Tax Rate and Effective Tax Rate for Enterprise Income Tax (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Loss before income tax	¥ (216,006)	$ (33,105)	¥ (171,443)	¥ (140,920)
Income tax benefit computed at the PRC statutory tax rate of 25%	(54,001)	(8,276)	(42,861)	(35,230)
Effect of differing tax rates in different jurisdictions	35,228	5,399	23,599	4,150
Effect of PRC preferential tax rates	(22,350)	(3,425)	(3,346)
Research and development super-deduction	(7,557)	(1,158)	(4,001)
Effect of tax rate changes on deferred taxes	5,325	816
Non-deductible expenses and non-taxable income, net	106,892	16,382	384	19,446
Change in valuation allowance	3,802	582	24,483	8,875
Income tax expense (benefit)	¥ 67,339	$ 10,320	¥ (1,742)	¥ (2,759)

Taxation - Schedule of Reconciliation of Differences Between Statutory Tax Rate and Effective Tax Rate for Enterprise Income Tax (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Statutory income tax rate	25.00%	25.00%	25.00%

Taxation - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Deferred tax assets
Tax loss carry forward	¥ 67,873	$ 10,402	¥ 67,708
Unabsorbed capital allowance	63,297	9,701	50,475
Depreciation and amortization expense	23,887	3,661	18,809
Operating lease	60,878	9,330	63,823
Accrued expenses and others	35,245	5,402	16,865
Less: Valuation allowance	71,229	10,916	73,997
Deferred tax assets	179,951	27,580	143,683
Deferred tax liabilities
Property and equipment	222,489	34,098	173,777
Acquisition of intangible assets	105,805	16,215	89,474
Debt issuance cost	13,243	2,030	15,588
Operating lease	64,358	9,863	63,823
Others	9,698	1,487	8,949
Deferred tax liabilities	415,593	63,693	351,611
Deferred tax assets	18,789	2,880	3,611
Deferred tax liabilities	254,431	38,993	211,539
Net deferred tax liabilities	¥ 235,642	$ 36,113	¥ 207,928

Share-Based Payments - Additional Information (Details) $ / shares in Units, $ in Thousands									1 Months Ended					12 Months Ended
	Sep. 30, 2020 CNY (¥) shares	Sep. 30, 2020 USD ($) shares	Aug. 26, 2020 CNY (¥) shares	Aug. 18, 2020 CNY (¥)	Aug. 18, 2020 USD ($)	May 29, 2020 shares	Apr. 13, 2020 shares	Sep. 11, 2019 Installment shares	Oct. 31, 2020 USD ($) shares	Sep. 30, 2020 CNY (¥) shares	Sep. 30, 2020 USD ($) shares	May 31, 2020 Installment shares	Dec. 31, 2019	Dec. 31, 2020 CNY (¥) shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Jan. 08, 2020 shares
BCPE Bridge Cayman, L.P. \| Pre IPO Private Placements
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of shareholding				21.81%	21.81%
Amount to be distributed to ISU holders				¥ 210,986,000	$ 30,500
Class B Ordinary Shares \| Bridge Management, L.P. \| BCPE Bridge Limited Partnership Agreement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Conversion of outstanding shares									26,797,650
2019 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average exercise price for share options granted \| $ / shares															$ 0.73
2020 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
ESOP contractual term												10 years
Share-based payment award, options, exercised			5,667,164											5,667,164	5,667,164
Share-based compensation expense										¥ 21,914,000	$ 3,358
Number of shares vesting accelerated										1,125,600	1,125,600
Weighted-average exercise price for share options granted \| $ / shares															$ 1.47
Number of shares granted						5,667,164								14,138,509	14,138,509
Stock option vesting percentage												50.00%
Number of Equal Installments to Vest Shares \| Installment												2
Proceeds from stock option exercised \| ¥			¥ 5,667,000
Weighted-average exercise price for share options forfeited \| $ / shares															$ 1.00
Weighted-average exercise price for share options outstanding \| $ / shares															1.79
Weighted-average exercise price for share options expected to vest \| $ / shares															1.79
Weighted-average exercise price for share options exercisable \| $ / shares															$ 1.01
Aggregate intrinsic value of share options outstanding \| $															$ 55,150
Aggregate intrinsic value of share options currently exercisable \| $															$ 12,373
Weighted-average remaining contractual term of share options outstanding														9 years 8 months 12 days	9 years 8 months 12 days
Weighted-average remaining contractual term of share options currently exercisable														9 years 8 months 1 day	9 years 8 months 1 day
2020 Plan \| Certain Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted									2,805,000	5,666,345	5,666,345
Stock option vesting service period									4 years
2020 Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate number of shares authorized	11,334,328	11,334,328								11,334,328	11,334,328	5,667,164			22,291,218
2020 Plan \| Service-based Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option vesting percentage												50.00%
Number of Equal Installments to Vest Shares \| Installment												4
Stock option vesting service period												4 years
2019 Plan and 2020 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized employee share-based compensation expenses \| $															$ 73,257
Expected to recognized weighted-average period														1 year 7 months 17 days	1 year 7 months 17 days
2019 Plan and 2020 Plan \| Service-based Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense									$ 35,907					¥ 234,291,000
ISUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense														¥ 135,682,000	$ 20,794	¥ 63,746,000	¥ 0
Expected to recognized weighted-average period														1 year 6 months	1 year 6 months
Total unrecognized employee share-based compensation expenses \| $															$ 22,899
Class B \| Bridge Management, L.P. \| BCPE Bridge Limited Partnership Agreement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share issued to SBC platform									1,000,000
BCPE Stack ESOP Holdco Limited \| 2019 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense	¥ 27,580,000	$ 4,227
Number of shares vesting accelerated	3,808,818	3,808,818
BCPE Bridge Cayman, L.P. \| Class B
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense	¥ 5,132,000	$ 787
Number of shares vesting accelerated	31,137	31,137
Number of shares issued								1,000,000
BCPE Bridge Cayman, L.P. \| Class B \| Granted During 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of vesting installments of remaining portion \| Installment								2
BCPE Bridge Cayman, L.P. \| Class B \| Maximum \| Granted During 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Service vesting period								5 years
BCPE Bridge Cayman, L.P. \| Class B \| Maximum \| Granted During 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Service vesting period								4 years
Number of vesting installments \| Installment								4
BCPE Bridge Cayman, L.P. \| Class B \| Minimum \| Granted During 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Service vesting period								1 year
BCPE Bridge Cayman, L.P. \| Class B \| Minimum \| Granted During 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Service vesting period								3 years
Number of vesting installments \| Installment								3
2019 Plan \| BCPE Stack ESOP Holdco Limited
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
ESOP contractual term													10 years
2019 Plan \| BCPE Stack ESOP Holdco Limited \| Class B
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
ESOP purchase options																		17,633,120
Share-based payment award, options, exercised							17,633,120
Number of shares exchanged for ordinary shares															0

Share-Based Payments - Summary of Activity (Details) - $ / shares			12 Months Ended
	Aug. 26, 2020	May 29, 2020	Dec. 31, 2020
2019 Plan
Weighted average grant date fair value
Granted			$ 1.73
Vested			1.79
Awarded and unvested, ending balance			1.68
Expected to vest, ending balance			$ 1.68
2019 Plan \| ESOP Holdco Class B Shares
Number of Options/ISUs
Granted			17,633,120
Vested			(7,789,995)
Awarded and unvested, ending balance			9,843,125
Expected to vest, ending balance			9,843,125
2020 Plan
Number of Options/ISUs
Granted		5,667,164	14,138,509
Exercised	(5,667,164)		(5,667,164)
Awarded and unvested, ending balance			8,469,345
Expected to vest, ending balance			8,469,345
Forfeited			(2,000)
Exercisable, ending balance			1,696,614
Weighted average grant date fair value
Granted			$ 5.43
Exercised			3.55
Forfeited			4.61
Awarded and unvested, ending balance			6.68
Expected to vest, ending balance			6.68
Exercisable, ending balance			$ 4.63
ISUs
Number of Options/ISUs
Awarded and unvested, beginning balance			423,000
Granted			244,409
Vested			(121,892)
Forfeited			(160,000)
Awarded and unvested, ending balance			385,517
Expected to vest, ending balance			385,517
Weighted average grant date fair value
Awarded and unvested, beginning balance			$ 17.26
Granted			127.57
Vested			71.64
Forfeited			40.32
Awarded and unvested, ending balance			74.78
Expected to vest, ending balance			$ 74.78

Share-Based Payments - Summary of Assumptions Used to Estimate Fair Value of Share Options Granted (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares
2019 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free rate	1.90%
Expected volatility range, minimum	39.65%
Expected volatility range, maximum	39.78%
Exercise multiple	2.80
Fair value per ordinary share as at valuation dates	$ 2.32
2020 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free rate, minimum	0.57%
Risk-free rate, maximum	1.90%
Expected volatility range, minimum	39.65%
Expected volatility range, maximum	40.53%
Exercise multiple	2.80
Minimum \| 2020 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value per ordinary share as at valuation dates	$ 4.45
Maximum \| 2020 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value per ordinary share as at valuation dates	$ 14.00

Share-based Payments - Summary of Share-based Compensation Expenses Recognized in Income and Capitalized as Part of the Cost of Assets (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expenses	¥ 369,973	$ 56,701	¥ 63,746	¥ 0
Cost of Revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expenses	32,990	5,056	0	0
Selling and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expenses	21,691	3,324	0	0
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expenses	295,165	45,236	63,746	0
Construction in Progress
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expenses	¥ 20,127	$ 3,085	¥ 0	¥ 0

Related Party Transactions - Summary of Related Party Transactions (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Related Party Transaction [Line Items]
Related party transaction, amounts of transaction	¥ 245,755	$ 37,665	¥ 224,255	¥ 11,300
Wangsu
Related Party Transaction [Line Items]
Purchase of services	83,382	12,779	104,312
Net revenue from colocation services provided	83,054	12,729	95,071
Affiliates
Related Party Transaction [Line Items]
Management consulting services provided	59,741	9,156	16,434	¥ 11,300
Shareholder Affiliates
Related Party Transaction [Line Items]
Management consulting services provided	13,016	1,995	¥ 8,438
Qinyun
Related Party Transaction [Line Items]
Gain on divestiture	¥ 6,562	$ 1,006

Related Party Transactions - Summary of Related Party Transactions (Parenthetical) (Details) ¥ in Thousands, $ in Thousands			8 Months Ended	9 Months Ended		12 Months Ended
	Aug. 04, 2020 CNY (¥)	Aug. 04, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Oct. 02, 2020 CNY (¥)	Oct. 02, 2020 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Services revenue			¥ 70,861	¥ 62,440	$ 9,569
Equity interest	100.00%	100.00%
Purchase consideration transferred related to disposal of subsidiary	¥ 64,000
Gain resulting from assets transfer	¥ 6,562	$ 1,006
Chief Executive Officer
Related Party Transaction [Line Items]
Percentage of transfer of consideration	99.90%	99.90%
Third Party
Related Party Transaction [Line Items]
Percentage of transfer of consideration	0.10%	0.10%
Cash Affiliates
Related Party Transaction [Line Items]
Termination expenses								¥ 50,000	$ 7,663
Shareholder Affiliates
Related Party Transaction [Line Items]
Termination expenses						¥ 11,000	$ 1,686

Related Party Transactions - Summary of Related Party Balances (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Amounts due from related parties:
Company Affiliates	¥ 64,093	$ 9,823	¥ 88,929
Amounts due to related parties:
Company Affiliates			29,275
Affiliates	490	75	22,890
Shareholder Affiliates	36,978	5,667	8,022
Total	¥ 37,468	$ 5,742	¥ 60,187

Related Party Transactions - Additional Information (Details) - CNY (¥)	Dec. 31, 2020	Dec. 31, 2019
Related Party Transactions [Abstract]
Allowance for doubtful accounts recognized for due from related parties amount	¥ 0	¥ 0

Loss Per Share - Summary of Basic and Diluted Loss Per Share (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥) ¥ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 CNY (¥) ¥ / shares shares	Dec. 31, 2018 CNY (¥) ¥ / shares shares
Numerator:
Net loss attributable to ordinary shareholders—basic and diluted	¥ (283,345)	$ (43,425)	¥ (174,443)	¥ (138,161)
Denominator:
Weighted average number of shares outstanding—basic and diluted	613,673,576	613,673,576	397,153,121	97,550,502
Basic and diluted \| (per share)	¥ (0.46)	$ (0.07)	¥ (0.44)	¥ (1.42)
Ordinary Shares
Numerator:
Net loss attributable to ordinary shareholders—basic and diluted \| ¥			¥ (174,443)	¥ (138,161)
Denominator:
Weighted average number of shares outstanding—basic and diluted			397,153,121	97,550,502
Basic and diluted \| ¥ / shares			¥ (0.44)	¥ (1.42)
Class A
Numerator:
Net loss attributable to ordinary shareholders—basic and diluted	¥ (105,403)	$ (16,154)
Denominator:
Weighted average number of shares outstanding—basic and diluted	228,284,218	228,284,218
Basic and diluted \| (per share)	¥ (0.46)	$ (0.07)
Class B
Numerator:
Net loss attributable to ordinary shareholders—basic and diluted	¥ (177,942)	$ (27,271)
Denominator:
Weighted average number of shares outstanding—basic and diluted	385,389,358	385,389,358
Basic and diluted \| (per share)	¥ (0.46)	$ (0.07)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22595-107794

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669625-108580

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(18))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(20))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22658-107794

+ Details

Accumulated Other Comprehensive Income (Loss) - Summary of Accumulated Other Comprehensive Income (Loss) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Beginning balance	¥ 40,011		¥ 18,044	¥ 12
Foreign currency translation adjustments	(212,597)	$ (32,582)	21,967	18,032
Ending balance	¥ (172,586)	$ (26,450)	¥ 40,011	¥ 18,044

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References + Details

Accumulated Other Comprehensive Income (Loss) - Summary of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Foreign currency translation adjustments, net of tax	¥ 0	$ 0	¥ 0	¥ 0

Business Combination - Additional Information (Details) ¥ in Thousands, $ in Thousands			12 Months Ended
	Nov. 01, 2020 CNY (¥)	Apr. 26, 2019 CNY (¥)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Business Acquisition [Line Items]
Percentage of ownership interests acquired		100.00%
Purchase consideration		¥ 2,772,317
PRC Subsidiary
Business Acquisition [Line Items]
Date of acquisition		Apr. 26, 2019
Percentage of ownership interests acquired		100.00%
Remeasurement gain of profit or loss			¥ 7,762	$ 1,190	¥ 1,127
Purchase consideration		¥ 2,772,317
PRC Subsidiary \| Maximum
Business Acquisition [Line Items]
Total purchase price consideration			¥ 48,000		¥ 48,000
Estimated remaining useful life of identifiable intangible assets			10 years	10 years
Huailai Huizhi Construction Co. Ltd.
Business Acquisition [Line Items]
Date of acquisition	Nov. 01, 2020
Percentage of ownership interests acquired	100.00%
Purchase consideration	¥ 39,612

Business Combination - Summary of Purchase Consideration on Acquisition Date (Details) ¥ in Thousands	Apr. 26, 2019 CNY (¥)
Business Acquisition [Line Items]
Total purchase price consideration	¥ 2,772,317
PRC Subsidiary
Business Acquisition [Line Items]
Cash consideration	2,785,820
Contingent receivable	(13,503)
Total purchase price consideration	¥ 2,772,317

Business Combination - Summary of Fair Value of Assets Acquired and Liabilities Assumed on Acquisition Date (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Nov. 01, 2020 CNY (¥)	Nov. 01, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Apr. 26, 2019 CNY (¥)
Business Acquisition [Line Items]
Goodwill	¥ 472,883	$ 72,472			¥ 466,320
PRC Subsidiary
Business Acquisition [Line Items]
Purchase consideration						¥ 2,772,317
Cash and cash equivalents						892,009
Restricted cash						14,771
Other current assets						304,495
Property and equipment, net						1,591,412
Customer relationships						372,025
Operating lease right-of-use assets						392,286
Other non-current assets						113,038
Other current liabilities						(670,648)
Deferred tax liabilities						(116,019)
Other non-current liabilities						(587,372)
Goodwill						¥ 466,320
Huailai Huizhi Construction Co. Ltd.
Business Acquisition [Line Items]
Purchase consideration			¥ 39,612	$ 6,071
Settlement of accounts payable due to Huizhi			(174,695)	(26,773)
Purchase consideration			(135,083)	(20,702)
Cash and cash equivalents			16,008	2,453
Other current assets			24,085	3,691
Property and equipment, net			641	98
Other non-current assets			1,022	157
Current liabilities			(183,402)	(28,108)
Goodwill			¥ 6,563	$ 1,007

Business Combination - Summary of Proforma Information (Details) - PRC Subsidiary - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Pro forma revenue	¥ 1,098,383	¥ 418,910
Pro forma net loss attributable to Chindata Group Holdings Limited	¥ (141,745)	¥ (202,714)

Restricted Net Assets - Additional Information (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Disclosure Of Restricted Net Assets [Line Items]
Description of allocation of tax profit to general reserve	In accordance with the Regulations on Enterprises with Foreign Investment of China and their Articles of Association, the Company’s wholly foreign-owned enterprises, being foreign invested enterprise established in the PRC, are required to allocate at least 10% of their after-tax profit determined based on the PRC accounting standards and regulations to the general reserve until the reserve has reached 50% of the relevant subsidiary’s registered capital.
Statutory reserves	¥ 82,792	$ 12,688	¥ 13,908
Restricted net assets	¥ 2,594,646	$ 397,647
VIEs
Disclosure Of Restricted Net Assets [Line Items]
Description of allocation of tax profit to general reserve	In accordance with the PRC Company Laws, the VIEs must make appropriations from their annual after-tax profits as reported in their PRC statutory accounts to non-distributable reserve funds, namely statutory reserve and discretionary surplus reserve. The VIEs are required to allocate at least 10% of their after-tax profits to the statutory reserve until such fund has reached 50% of their respective registered capital.
Minimum
Disclosure Of Restricted Net Assets [Line Items]
Percentage of allocation of after tax profit	10.00%
Minimum \| VIEs
Disclosure Of Restricted Net Assets [Line Items]
Percentage of allocation of after tax profit	10.00%

Commitments and Contingencies - Additional Information (Details) - 12 months ended Dec. 31, 2020 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)	USD ($)
Commitments And Contingencies Disclosure [Line Items]
Capital expenditure commitments	¥ 681,263	$ 104,408
Purchase agreement, termination date	August 2020	August 2020
Others, Net
Commitments And Contingencies Disclosure [Line Items]
Loss contingency accrual	¥ 32,558		$ 4,990
Minimum
Commitments And Contingencies Disclosure [Line Items]
Capital expenditure commitments, period	1 year	1 year
Maximum
Commitments And Contingencies Disclosure [Line Items]
Capital expenditure commitments, period	2 years	2 years

Segment Information - Additional Information (Details)	12 Months Ended
Segment Information - Additional Information (Details)	Dec. 31, 2020 Segment
Segment Reporting [Abstract]
Number of reportable segment	1

Segment Information - Summary of Net Revenues by Geographic Area (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Segment Reporting Information [Line Items]
Total net revenue	¥ 1,831,077	$ 280,625	¥ 853,010	¥ 98,484
PRC
Segment Reporting Information [Line Items]
Total net revenue	1,706,086	261,469	712,115
Malaysia
Segment Reporting Information [Line Items]
Total net revenue	¥ 124,991	$ 19,156	¥ 140,895	¥ 98,484

- Definition

+ References

+ Details

Segment Information - Summary of Long-lived Assets by Geographic Area (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	¥ 7,204,128	$ 1,104,081	¥ 4,990,222
PRC
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	6,016,479	922,066	3,807,201
Malaysia
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	958,408	146,882	974,353
India
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	¥ 229,241	$ 35,133	¥ 208,668

Condensed Financial Information of the Parent Company - Condensed Balance Sheets (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Current assets
Cash and cash equivalents	¥ 6,705,612	$ 1,027,680	¥ 1,038,897	¥ 104,207
Total current assets	7,589,976	1,163,213	1,573,131
Non-current assets
Total non-current assets	8,669,622	1,328,677	6,198,052
Total assets	16,259,598	2,491,890	7,771,183
Current liabilities
Amounts due to related parties	37,468	5,742	60,187
Total current liabilities	1,832,940	280,910	1,266,779
Non-current liabilities
Other non-current liabilities	260,225	39,881	78,510
Total non-current liabilities	4,687,190	718,342	3,267,231
Total liabilities	6,520,130	999,252	4,534,010
Shareholders’ equity:
Ordinary shares (par value of US$0.00001 per share, 5,000,000,000 shares authorized, 566,716,480 shares issued and outstanding as of December 31, 2019; 4,500,000,000 Class A ordinary shares authorized, 344,577,783 Class A ordinary shares issued and outstanding; 500,000,000 Class B ordinary shares authorized, 380,214,434 Class B ordinary shares issued and outstanding as of December 31, 2020)	46	7	34
Statutory reserves	82,792	12,688	13,908
Accumulated other comprehensive income (loss)	(172,586)	(26,450)	40,011	¥ 18,044	¥ 12
Accumulated deficit	(681,300)	(104,414)	(329,071)
Total shareholders’ equity	9,739,468	1,492,638	3,237,173
Total liabilities and shareholders’ equity	16,259,598	2,491,890	7,771,183
Parent Company
Current assets
Cash and cash equivalents	3,514,736	538,657	10,482
Amounts due from subsidiaries of the Group	2,894	444	2,252
Total current assets	3,517,630	539,101	12,734
Non-current assets
Investment in subsidiaries	6,318,785	968,397	3,239,690
Total non-current assets	6,318,785	968,397	3,239,690
Total assets	9,836,415	1,507,498	3,252,424
Current liabilities
Amounts due to related parties	36,978	5,667	15,251
Accrued expenses and other payables	28,410	4,356
Total current liabilities	65,388	10,023	15,251
Non-current liabilities
Other non-current liabilities	31,559	4,837
Total non-current liabilities	31,559	4,837
Total liabilities	96,947	14,860	15,251
Shareholders’ equity:
Ordinary shares (par value of US$0.00001 per share, 5,000,000,000 shares authorized, 566,716,480 shares issued and outstanding as of December 31, 2019; 4,500,000,000 Class A ordinary shares authorized, 344,577,783 Class A ordinary shares issued and outstanding; 500,000,000 Class B ordinary shares authorized, 380,214,434 Class B ordinary shares issued and outstanding as of December 31, 2020)	46	7	34
Additional paid-in capital	10,510,516	1,610,807	3,512,291
Statutory reserves	82,792	12,688	13,908
Accumulated other comprehensive income (loss)	(172,586)	(26,450)	40,011
Accumulated deficit	(681,300)	(104,414)	(329,071)
Total shareholders’ equity	9,739,468	1,492,638	3,237,173
Total liabilities and shareholders’ equity	¥ 9,836,415	$ 1,507,498	¥ 3,252,424

Condensed Financial Information of the Parent Company - Condensed Balance Sheets (Parenthetical) (Details) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements Captions [Line Items]
Common stock, par value per share	$ 0.00001	$ 0.00001
Common stock, shares authorized	5,000,000,000	5,000,000,000
Common stock, shares, issued		566,716,480
Common stock, value, outstanding		566,716,480
Class A Ordinary Shares
Condensed Financial Statements Captions [Line Items]
Common stock, shares authorized	4,500,000,000
Common stock, shares, issued	344,577,783
Common stock, value, outstanding	344,577,783
Class B Ordinary Shares
Condensed Financial Statements Captions [Line Items]
Common stock, shares authorized	500,000,000
Common stock, shares, issued	380,214,434
Common stock, value, outstanding	380,214,434
Parent Company
Condensed Financial Statements Captions [Line Items]
Common stock, par value per share	$ 0.00001	$ 0.00001
Common stock, shares authorized	5,000,000,000	5,000,000,000
Common stock, shares, issued		566,716,480
Common stock, value, outstanding		566,716,480
Parent Company \| Class A Ordinary Shares
Condensed Financial Statements Captions [Line Items]
Common stock, shares authorized	4,500,000,000
Common stock, shares, issued	344,577,783
Common stock, value, outstanding	344,577,783
Parent Company \| Class B Ordinary Shares
Condensed Financial Statements Captions [Line Items]
Common stock, shares authorized	500,000,000
Common stock, shares, issued	380,214,434
Common stock, value, outstanding	380,214,434

Condensed Financial Information of the Parent Company - Condensed Statements of Comprehensive Loss (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Operating expenses
General and administrative expenses	¥ 564,286	$ 86,481	¥ 232,837	¥ 57,980
Total operating expenses	(704,553)	(107,978)	(304,843)	(84,670)
Operating (loss) income	28,228	4,326	(62,054)	(121,446)
Interest income	27,616	4,232	7,161	97
Interest expense	(238,384)	(36,534)	(102,290)	(24,344)
Net loss attributable to Chindata Group Holdings Limited	(283,345)	(43,425)	(174,443)	(138,161)
Other comprehensive income (foreign currency translation adjustments), net of tax of nil:	(212,597)	(32,582)	21,967	18,032
Comprehensive loss	(495,942)	(76,007)	(147,734)	(120,129)
Parent Company
Operating expenses
General and administrative expenses	(53,945)	(8,267)	(33,523)
Total operating expenses	(53,945)	(8,267)	(33,523)
Operating (loss) income	(53,945)	(8,267)	(33,523)
Interest income	1,854	284
Interest expense			47
Share of losses of subsidiaries and the VIEs	(232,287)	(35,600)	(140,967)	(138,161)
Foreign currency exchange loss	(1,193)	(183)
Others, net	2,226	341
Net loss attributable to Chindata Group Holdings Limited	(283,345)	(43,425)	(174,443)	(138,161)
Other comprehensive income (foreign currency translation adjustments), net of tax of nil:	(212,597)	(32,582)	21,967	18,032
Comprehensive loss	¥ (495,942)	$ (76,007)	¥ (152,476)	¥ (120,129)

Condensed Financial Information of the Parent Company - Condensed Statements of Cash Flows (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Condensed Financial Statements Captions [Line Items]
Net cash generated from operating activities	¥ 664,910	$ 101,902	¥ 40,167	¥ (25,601)
Net cash used in investing activities	(2,769,269)	(424,409)	(3,520,639)	(1,052,317)
Net cash generated from financing activities	8,188,802	1,254,989	4,456,328	1,177,372
Effect of exchange rate changes on cash and cash equivalents	(292,820)	(44,877)	(719)	19,891
Net increase in cash, cash equivalents, and restricted cash	5,791,623	887,605	975,137	¥ 119,345
Parent Company
Condensed Financial Statements Captions [Line Items]
Net cash generated from operating activities	(22,553)	(3,456)	(26,093)
Net cash used in investing activities	(2,893,144)	(443,394)	(601,174)
Net cash generated from financing activities	6,683,039	1,024,221	637,792
Effect of exchange rate changes on cash and cash equivalents	(263,088)	(40,320)	(43)
Net increase in cash, cash equivalents, and restricted cash	3,504,254	537,051	10,482
Cash and cash equivalents at beginning of the year	10,482	1,606
Cash and cash equivalents at end of the year	¥ 3,514,736	$ 538,657	¥ 10,482

Condensed Financial Information of the Parent Company - Basis of Presentation - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 CNY (¥)
Parent Company
Condensed Financial Statements Captions [Line Items]
Dividend paid	¥ 0