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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Total carrying value of equity (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
Equity investments without readily determinable fair value: |  |  |  |  |
Initial cost basis | ¥ 124,196 |  | $ 17,493 | ¥ 124,196 | ¥ 114,256
Cumulative unrealized gains | 119,245 |  | 16,795 | 119,245 | 96,793
Cumulative unrealized losses (including impairment) | (28,522) |  | (4,017) | (14,940) |
Foreign currency translation | 979 |  | 138 | 271 | (3,883)
Equity investments without readily determinable fair value | 215,898 |  | 30,409 | 228,772 | 207,166
Equity investment with readily determinable fair value: |  |  |  |  |
Initial cost basis | 42,437 |  | 5,977 | 63,356 |
Cumulative unrealized losses | (12,469) |  | (1,756) | (22,683) |
Realized gain on equity investments sold | 100 | $ 14 |  |  |
Foreign currency translation | 205 |  | 29 | 4,135 |
Equity investments with readily determinable fair value | 30,273 |  | 4,264 | 44,808 |
Equity method investment |  |  |  |  |
Initial cost basis | 12,070 |  | 1,700 |  |
Share of profit from equity method investment | 1,689 | $ 237 |  |  |
Equity method investments | 13,759 |  | 1,937 |  |
Total carrying value | ¥ 259,930 |  | $ 36,610 | ¥ 273,580 | ¥ 207,166

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