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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2023
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Summary of total carrying value of equity investments held | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended December 31
​ |  | 2021 |  | 2022 |  | 2023 |  | 2023
​ | ​ | RMB | ​ | RMB | ​ | RMB | ​ | US$
Equity investments without readily determinable fair value: |  |  |  |  |  |  |  |
Initial cost basis |  | 114,256 |  | 124,196 |  | 124,196 |  | 17,493
Cumulative unrealized gains |  | 96,793 |  | 119,245 |  | 119,245 |  | 16,795
Cumulative unrealized losses (including impairment) |  | — |  | (14,940) |  | (28,522) |  | (4,017)
Foreign currency translation |  | (3,883) |  | 271 |  | 979 |  | 138
​ |  | 207,166 |  | 228,772 |  | 215,898 |  | 30,409
Equity investment with readily determinable fair value: |  | ​ |  | ​ |  | ​ |  | ​
Initial cost basis |  | — |  | 63,356 |  | 42,437 |  | 5,977
Cumulative unrealized losses |  | — |  | (22,683) |  | (12,469) |  | (1,756)
Realized gain on equity investments sold | ​ | — | ​ | — | ​ | 100 | ​ | 14
Foreign currency translation |  | — |  | 4,135 |  | 205 |  | 29
​ |  | — |  | 44,808 |  | 30,273 |  | 4,264
Equity method investment | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Initial cost basis | ​ | — | ​ | — | ​ | 12,070 | ​ | 1,700
Share of profit from equity method investment | ​ | — | ​ | — | ​ | 1,689 | ​ | 237
​ | ​ | — | ​ | — | ​ | 13,759 | ​ | 1,937
Total carrying value |  | 207,166 |  | 273,580 |  | 259,930 |  | 36,610
Schedule of assets and liabilities measured at fair value on a recurring and non-recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Quoted prices in |  | Significant |  | ​ |  | ​
​ | ​ | ​ | ​ | active markets | ​ | other | ​ | Significant | ​ | ​
​ | ​ | Total Fair | ​ | for identical | ​ | observable | ​ | unobservable | ​ | Total
​ | ​ | Value | ​ | assets | ​ | inputs | ​ | inputs | ​ | losses
​ | ​ | ​ | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | ​
​ |  | RMB |  | RMB |  | RMB |  | RMB |  | RMB
As of December 31, 2022 |  |  |  |  |  |  |  |  |  |
Purchase consideration payable |  | (1,208,985) |  | — |  | (1,208,985) |  | — |  | (28,516)
Equity investments with readily determinable fair value | ​ | 44,808 | ​ | 44,808 | ​ | — | ​ | — | ​ | (22,683)
As of December 31, 2023 |  | ​ |  | ​ |  | ​ |  | ​ |  | ​
Purchase consideration payable |  | (678,732) |  | — |  | (678,732) |  | — |  | (14,433)
Equity investments with readily determinable fair value |  | 30,273 |  | 30,273 |  | — |  | — |  | (12,469)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Quoted prices in |  | Significant |  | ​ |  | ​
​ | ​ | ​ | ​ | active markets | ​ | other | ​ | Significant | ​ | ​
​ | ​ | Total Fair | ​ | for identical | ​ | observable | ​ | unobservable | ​ | Total
​ | ​ | Value | ​ | assets | ​ | inputs | ​ | inputs | ​ | gains
​ | ​ | ​ | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | (losses)
​ |  | RMB |  | RMB |  | RMB |  | RMB |  | RMB
As of December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity investments accounted for using measurement alternative |  | 228,772 |  | — |  | — |  | 228,772 |  | 22,452
As of December 31, 2023 |  | ​ |  |  |  |  |  | ​ |  |
Equity investments accounted for using measurement alternative |  | 215,898 |  | — |  | — |  | 215,898 |  | —
Long-lived assets in public cloud asset group (Note 8) | ​ | 3,026,228 | ​ | — | ​ | — | ​ | 3,026,228 | ​ | (653,670)
Schedule of property plant and equipment useful lives |
​ | ​ | ​
​ |  | Estimated
Category | ​ | Useful Life
Electronic equipment | ​ | 3-4 years
Office equipment and fixtures |  | 5 years
Data center machinery and equipment |  | 10 years
Building |  | 50 years
​
Schedule of finite lived intangible assets useful lives |
​ | ​ | ​
​ |  | Estimated
Category | ​ | Useful Life
Customer relationships |  | 6 years
Patents and technologies |  | 6-10 years
Trademarks and domain names |  | 10 years
Software and copyrights |  | 3-10 years
Others |  | 3 years

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