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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Schedule of financial statement balances and amounts of the VIEs and their subsidiaries and schedule of net revenue and net income, operating, investing and financing cash flows of VIEs | ​
​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2019 |  | 2020
Assets |  |  |  |
Current assets |  |  |  |
Cash |  | 730,960 |  | 1,310,269
Accounts receivable, net of allowance for doubtful accounts |  | 858,764 |  | 1,388,128
VAT recoverable |  | 46,817 |  | 85,760
Prepaid expenses |  | 39,124 |  | 76,505
Other current assets |  | 32,929 |  | 13,259
Total current assets |  | 1,708,594 |  | 2,873,921
​ | ​ | ​ | ​ | ​
Property and equipment, net |  | 2,911,727 |  | 2,760,618
Intangible assets, net |  | 159,860 |  | 194,230
Operating lease right-of-use assets |  | 91,329 |  | 430,525
Deferred tax assets |  | 34,157 |  | 43,126
Restricted cash |  | 29,508 |  | 49,905
VAT recoverable |  | 136,011 |  | 113,684
Other non-current assets |  | 75,873 |  | 115,315
Total assets |  | 5,147,059 |  | 6,581,324
​ | ​ | ​ | ​ | ​
Liabilities |  |  |  |
Current liabilities |  |  |  |
Short-term borrowings and current portion of long-term borrowings |  | 493,614 |  | 628,721
Accounts payable |  | 181,448 |  | 194,325
Accrued expenses and other payables |  | 160,401 |  | 152,534
Deferred revenue |  | 68,003 |  | 90,192
Operating lease liabilities, current |  | 31,869 |  | 50,888
Finance lease and other financing obligations, current |  | 125,318 |  | 31,629
Total current third-party liabilities |  | 1,060,653 |  | 1,148,289
​ | ​ | ​ | ​ | ​
Long-term borrowings, excluding current portion |  | 1,335,084 |  | 1,213,020
Operating lease liabilities, non-current |  | 66,387 |  | 361,502
Finance lease and other financing obligations, non-current |  | 921,965 |  | 982,209
Deferred tax liabilities |  | 76,297 |  | 91,036
Other long-term liabilities |  | 29,950 |  | 34,281
Total third-party liabilities |  | 3,490,336 |  | 3,830,337
Amounts due to GDS Holdings and its non-VIE subsidiaries, net |  | 1,534,768 |  | 2,531,025
Total liabilities |  | 5,025,104 |  | 6,361,362
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2018 |  | 2019 |  | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​
Net revenue |  | 2,712,875 |  | 4,013,561 | ​ | 5,453,802
Net (loss) income |  | (59,757) |  | 99,857 | ​ | 129,254
Net cash provided by operating activities | ​ | 739,848 | ​ | 414,424 | ​ | 899,132
Net cash used in investing activities | ​ | (1,063,826) | ​ | (201,995) | ​ | (278,744)
Net cash provided by (used in) financing activities | ​ | 614,575 | ​ | (43,547) | ​ | (20,682)
​
Schedule of estimated useful lives of property and equipment | ​
​ | ​ | ​
Land | ​ | Remaining lease terms
Buildings |  | Shorter of the lease term and 30 years
Data center equipment | ​ | ​
– Machinery | ​ | 10 - 20 years
– Other equipment | ​ | 3 - 5 years
Leasehold improvement | ​ | Shorter of the lease term and the estimated useful lives of the assets
Furniture and office equipment | ​ | 3 - 5 years
Vehicles | ​ | 5 years
​
Schedule of asset retirement obligations | ​
​ | ​ | ​
Asset retirement obligations as of January 1, 2018 |  | 17,648
Additions |  | 16,391
Accretion expense |  | 1,840
Asset retirement obligations as of December 31, 2018 | ​ | 35,879
Additions | ​ | 13,572
Accretion expense | ​ | 2,990
Asset retirement obligations as of December 31, 2019 | ​ | 52,441
Additions | ​ | 20,384
Accretion expense | ​ | 4,084
Asset retirement obligations as of December 31, 2020 |  | 76,909
​
Schedule of weighted-average amortization period of acquired intangible assets | ​
​ | ​ | ​
Customer relationships |  | 5-15 years
Licenses | ​ | 20 years
​
Schedule of reconciliation of total interest costs to "Interest expenses" as reported in the consolidated statements of operations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2018 |  | 2019 |  | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​
Total interest costs |  | 749,730 |  | 1,040,898 | ​ | 1,402,015
Less: interest costs capitalized |  | (93,544) |  | (72,205) | ​ | (85,509)
​ | ​ | ​ | ​ | ​ | ​ | ​
Interest expenses |  | 656,186 |  | 968,693 | ​ | 1,316,506
Schedule of cash and restricted cash deposited in major financial institutions located in PRC, Hong Kong SAR, US and Singapore | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | RMB |  | USD |  | HKD |  | JPY |  | EUR |  | SGD
In PRC |  | 3,528,438 |  | 1,337,547 |  | — |  | — | ​ | — | ​ | —
In Hong Kong SAR |  | 25,986 |  | 511,405 |  | 185,909 |  | 35,821 | ​ | 146 | ​ | —
In US | ​ | — | ​ | 10,271 | ​ | — | ​ | — | ​ | — | ​ | —
In Singapore | ​ | — | ​ | 97,757 | ​ | — | ​ | — | ​ | — | ​ | 1,927
Total in original currency |  | 3,554,424 |  | 1,956,980 |  | 185,909 |  | 35,821 | ​ | 146 | ​ | 1,927
RMB equivalent |  | 3,554,424 |  | 12,769,100 |  | 156,461 |  | 2,265 | ​ | 1,175 | ​ | 9,504

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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5747-111685 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6228884-111685 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5710-111685 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5728-111685 + Details
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