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CRYPTOCURRENCIES - Additional Information (Details) ¥ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2025 CNY (¥) item contract | Dec. 31, 2024 CNY (¥) contract item | Dec. 31, 2023 CNY (¥) item | Dec. 31, 2022 item | Dec. 31, 2021 item | Dec. 31, 2025 USD ($) item | Dec. 31, 2024 USD ($) item | Dec. 31, 2023 USD ($) item | Jan. 01, 2023 CNY (¥) | Jan. 01, 2023 USD ($) | Mar. 31, 2021 item
Crypto Asset, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in cryptocurrencies | ¥ 252,206 | ¥ 206,130 | ¥ 107,961 |  |  | $ 36,065,000 |  |  |  |  |
Decrease in accumulated deficit | (4,832,656) | (4,430,210) |  |  |  | (691,061,000) |  |  |  |  |
Value of units pledged | ¥ | 238,533 | 193,938 |  |  |  |  |  |  |  |  |
Cryptocurrencies, restricted-current | ¥ 238,533 | ¥ 193,938 |  |  |  | 34,110,000 |  |  |  |  |
Number of pledged loan contracts signed | contract | 8 | 6 |  |  |  |  |  |  |  |  |
Cumulative effect period of adoption |  |  |  |  |  |  |  |  |  |  |
Crypto Asset, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in cryptocurrencies |  |  |  |  |  |  |  |  | ¥ 1,500 | $ 200,000 |
Decrease in accumulated deficit |  |  |  |  |  |  |  |  | ¥ 1,500 | $ 200,000 |
Filecoin Mining |  |  |  |  |  |  |  |  |  |  |
Crypto Asset, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of units owned |  | 200,547 |  |  |  |  | 200,547 |  |  |  |
Bitcoins |  |  |  |  |  |  |  |  |  |  |
Crypto Asset, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in cryptocurrencies | ¥ 238,886 | ¥ 196,680 |  |  |  | $ 34,160,000 |  |  |  |  |
Number of units owned | 387 | 287 | 306 |  |  | 387 | 287 | 306 |  |  |
Less: Cryptocurrencies, restricted | 386 | 273 | 38 |  |  | 386 | 273 | 38 |  |  | 110
Value of units pledged | ¥ 238,500 | ¥ 187,300 | ¥ 11,400 |  |  | $ 34,100,000 | $ 26,800,000 | $ 1,600,000 |  |  |
Number of units pledged, current |  |  | 30 |  |  |  |  | 30 |  |  |
Cryptocurrencies, restricted-current |  |  | ¥ 9,100 |  |  |  |  | $ 1,300,000 |  |  |
Number of units pledged, non-current |  |  | 8 |  |  |  |  | 8 |  |  |
Cryptocurrencies, restricted non-current |  |  | ¥ 2,400 |  |  |  |  | $ 300,000 |  |  |
Number of units released |  | 38 | 32 | 0 | 40 |  |  |  |  |  |
Bitcoins | Loans Payable |  |  |  |  |  |  |  |  |  |  |
Crypto Asset, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ |  |  |  |  |  | 25,100,000 | $ 12,500,000 |  |  |  |
Tether |  |  |  |  |  |  |  |  |  |  |
Crypto Asset, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in cryptocurrencies | ¥ 11,713 | ¥ 2,154 |  |  |  | $ 1,675,000 |  |  |  |  |
Number of units owned | 1,666,489 |  |  |  |  | 1,666,489 | 299,630 |  |  |  |
Less: Cryptocurrencies, restricted | 1,500,000 |  |  |  |  | 1,500,000 |  |  |  |  | 1,500,000
Number of units released |  |  |  | 0 | 1,500,000 |  |  |  |  |  |
Filecoin |  |  |  |  |  |  |  |  |  |  |
Crypto Asset, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in cryptocurrencies | ¥ |  | ¥ 7,296 |  |  |  |  |  |  |  |  |
Number of units owned | 0 | 200,547 |  |  |  | 0 | 200,547 |  |  |  |
Less: Cryptocurrencies, restricted |  | 183,212 |  |  |  |  | 183,212 |  |  |  |
Cryptocurrencies, restricted-current |  | ¥ 6,700 |  |  |  |  | $ 1,000,000 |  |  |  |
USD Coin |  |  |  |  |  |  |  |  |  |  |
Crypto Asset, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in cryptocurrencies | ¥ 1,607 |  |  |  |  | $ 230,000 |  |  |  |  |
Number of units owned | 228,601 | 0 |  |  |  | 228,601 | 0 |  |  |  |

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