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CRYPTOCURRENCIES - Summary of intangible assets (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2025 CNY (¥) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($)
--- | --- | --- | --- | --- | --- | ---
Intercompany Foreign Currency Balance [Line Items] |  |  |  |  |  |
Total | ¥ 252,206 | $ 36,065 | ¥ 206,130 |  | ¥ 107,961 |
Cryptocurrencies, restricted-current | 238,533 | 34,110 | 193,938 |  |  |
Balance of Cryptocurrencies | 13,673 | 1,955 | 12,192 |  |  |
Bitcoins |  |  |  |  |  |
Intercompany Foreign Currency Balance [Line Items] |  |  |  |  |  |
Total | 238,886 | 34,160 | 196,680 |  |  |
Cryptocurrencies, restricted-current |  |  |  |  | 9,100 | $ 1,300
Cryptocurrencies, restrict-Non current |  |  |  |  | ¥ 2,400 | $ 300
Tether |  |  |  |  |  |
Intercompany Foreign Currency Balance [Line Items] |  |  |  |  |  |
Total | 11,713 | 1,675 | 2,154 |  |  |
USD Coin |  |  |  |  |  |
Intercompany Foreign Currency Balance [Line Items] |  |  |  |  |  |
Total | ¥ 1,607 | $ 230 |  |  |  |
Filecoin |  |  |  |  |  |
Intercompany Foreign Currency Balance [Line Items] |  |  |  |  |  |
Total |  |  | 7,296 |  |  |
Cryptocurrencies, restricted-current |  |  | ¥ 6,700 | $ 1,000 |  |

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