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CRYPTOCURRENCIES - Roll forward (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2025 CNY (¥) item | Dec. 31, 2025 USD ($) item | Dec. 31, 2024 CNY (¥) item | Dec. 31, 2023 CNY (¥) item | Dec. 31, 2025 USD ($) item
Cryptocurrencies |  |  |  |  |
Beginning of the year | ¥ 206,130 |  | ¥ 107,961 |  |
Receipt from exchange of other cryptocurrencies | 16,886 |  | 65,718 |  |
Additional from BTC Mortgage borrowing | 176,214 |  | 87,296 |  |
Proceeds from disposal of mining machines | 1,651 |  | 2,283 |  |
Payment for operating activities | 88,310 |  | 104,186 |  |
Repayment of BTC Mortgage borrowings | (57,225) |  |  |  |
Sale of cryptocurrencies for cash | (67,948) |  | (109,023) |  |
Receipt from investors | 38,200 |  |  |  |
Sale of cryptocurrencies for other cryptocurrencies | (16,886) |  | (65,709) |  |
Interest expense | (3,127) |  | (1,194) |  |
Exchange gain (loss) for RMB/USD translation | (370) |  | 28 |  |
Realized gain (loss) on sale/exchange of cryptocurrencies | 10,627 | $ 1,520 | 60,783 | ¥ 42,836 |
Change in fair value of cryptocurrencies | (36,178) |  | 48,290 |  |
End of the year | 252,206 | $ 36,065 | 206,130 | ¥ 107,961 |
Less: Cryptocurrencies, restricted | 238,533 |  | 193,938 |  |
Balance of Cryptocurrencies | 13,673 |  | 12,192 |  | $ 1,955
Deferred loan costs | ¥ 3,500 |  | ¥ 900 |  |
Bitcoins |  |  |  |  |
Quantity |  |  |  |  |
Beginning of the year | item | 287 | 287 | 306 |  |
Receipt from mining, net | item |  |  | 4 |  |
Receipt of exchange of other cryptocurrencies | item |  |  | 17 |  |
Payments | item | 0 | 0 | (14) |  |
Receipt from investors | item | 60 | 60 |  |  |
Sale for cash | item | (20) | (20) | (145) |  |
Sale for other cryptocurrencies | item | (19) | (19) | (143) |  |
End of the year | item | 387 | 387 | 287 | 306 |
Less: Cryptocurrencies, restricted | item | 386 |  | 273 |  | 386
Balance of Cryptocurrencies | item | 1 |  | 14 |  | 1
Cryptocurrencies |  |  |  |  |
Beginning of the year | ¥ 196,680 |  | ¥ 92,205 |  |
Receipt of from Cryptocurrency mining |  |  | 1,107 |  |
Receipt from exchange of other cryptocurrencies |  |  | 8,814 |  |
Payment for operating activities | 3 |  | 8,238 |  |
Sale of cryptocurrencies for cash | (13,245) |  | (64,472) |  |
Receipt from investors | 33,937 |  |  |  |
Sale of cryptocurrencies for other cryptocurrencies | (12,439) |  | (53,250) |  |
Realized gain (loss) on sale/exchange of cryptocurrencies | 13,695 |  | 58,027 |  |
Change in fair value of cryptocurrencies | (36,091) |  | 51,748 |  |
End of the year | 238,886 |  | 196,680 | ¥ 92,205 |
Less: Cryptocurrencies, restricted | 238,533 |  | 187,273 |  |
Balance of Cryptocurrencies | ¥ 353 |  | ¥ 9,407 |  |
Bitcoins | Cryptocurrency mining revenue |  |  |  |  |
Quantity |  |  |  |  |
Receipt from mining, net | item | 79 | 79 | 262 |  |
Cryptocurrencies |  |  |  |  |
Receipt of from Cryptocurrency mining | ¥ 56,352 |  | ¥ 110,739 |  |
Tether |  |  |  |  |
Quantity |  |  |  |  |
Beginning of the year | item | 299,630 | 299,630 | 218,390 |  |
Receipt of exchange of other cryptocurrencies | item | 2,345,532 | 2,345,532 | 8,001,784 |  |
Additional from BTC Mortgage borrowing | item | 24,581,924 | 24,581,924 | 12,262,164 |  |
Proceeds from sale of mining machines | item | 230,000 | 230,000 | (319,600) |  |
Payments | item | (10,348,628) | (10,348,628) | (13,480,935) |  |
Receipt from investors | item | 600,010 | 600,010 |  |  |
Repayment of BTC Mortgage borrowing | item | (8,051,844) | (8,051,844) |  |  |
Sale for cash | item | (7,622,011) | (7,622,011) | (6,260,051) |  |
Sale for other cryptocurrencies | item | (6,836) | (6,836) | (593,419) |  |
Interest expense | item | (361,288) | (361,288) | (167,903) |  |
End of the year | item | 1,666,489 | 1,666,489 | 299,630 | 218,390 |
Balance of Cryptocurrencies | item | 1,666,489 |  | 299,630 |  | 1,666,489
Cryptocurrencies |  |  |  |  |
Beginning of the year | ¥ 2,154 |  | ¥ 1,547 |  |
Receipt from exchange of other cryptocurrencies | 16,837 |  | 56,904 |  |
Additional from BTC Mortgage borrowing | 176,214 |  | 87,296 |  |
Proceeds from disposal of mining machines | 1,651 |  | 2,283 |  |
Payment for operating activities | 73,959 |  | 95,944 |  |
Repayment of BTC Mortgage borrowings | (57,225) |  |  |  |
Sale of cryptocurrencies for cash | (54,703) |  | (44,551) |  |
Receipt from investors | 4,263 |  |  |  |
Sale of cryptocurrencies for other cryptocurrencies | (49) |  | (4,215) |  |
Interest expense | (3,127) |  | (1,194) |  |
Exchange gain (loss) for RMB/USD translation | (343) |  | 28 |  |
End of the year | 11,713 |  | 2,154 | ¥ 1,547 |
Balance of Cryptocurrencies | ¥ 11,713 |  | ¥ 2,154 |  |
Ethereum |  |  |  |  |
Quantity |  |  |  |  |
Beginning of the year | item |  |  | 80 |  |
Receipt from mining, net | item |  |  | 0 |  |
Sale for other cryptocurrencies | item |  |  | (80) |  |
End of the year | item |  |  |  | 80 |
Cryptocurrencies |  |  |  |  |
Beginning of the year |  |  | ¥ 1,302 |  |
Receipt of from Cryptocurrency mining |  |  | 4 |  |
Sale of cryptocurrencies for other cryptocurrencies |  |  | (1,905) |  |
Realized gain (loss) on sale/exchange of cryptocurrencies |  |  | 683 |  |
Change in fair value of cryptocurrencies |  |  | ¥ (84) |  |
End of the year |  |  |  | ¥ 1,302 |
Filecoin |  |  |  |  |
Quantity |  |  |  |  |
Beginning of the year | item | 200,547 | 200,547 | 273,289 |  |
Payments | item |  |  | (112) |  |
Sale for cash | item | (212,409) | (212,409) |  |  |
Sale for other cryptocurrencies | item |  |  | (119,410) |  |
End of the year | item |  |  | 200,547 | 273,289 |
Less: Cryptocurrencies, restricted | item |  |  | 183,212 |  |
Balance of Cryptocurrencies | item |  |  | 17,335 |  |
Cryptocurrencies |  |  |  |  |
Beginning of the year | ¥ 7,296 |  | ¥ 12,907 |  |
Payment for operating activities |  |  | 4 |  |
Sale of cryptocurrencies for other cryptocurrencies | (4,398) |  | (6,339) |  |
Realized gain (loss) on sale/exchange of cryptocurrencies | (3,068) |  | 2,073 |  |
Change in fair value of cryptocurrencies | ¥ (87) |  | (3,374) |  |
End of the year |  |  | 7,296 | ¥ 12,907 |
Less: Cryptocurrencies, restricted |  |  | 6,665 |  |
Balance of Cryptocurrencies |  |  | ¥ 631 |  |
Filecoin | Cryptocurrency mining revenue |  |  |  |  |
Quantity |  |  |  |  |
Receipt from mining, net | item | 11,862 | 11,862 | 46,780 |  |
Cryptocurrencies |  |  |  |  |
Receipt of from Cryptocurrency mining | ¥ 257 |  | ¥ 2,033 |  |
USD Coin |  |  |  |  |
Quantity |  |  |  |  |
Receipt from mining, net | item | 2,241,159 | 2,241,159 |  |  |
Receipt of exchange of other cryptocurrencies | item | 6,839 | 6,839 |  |  |
Payments | item | (2,019,385) | (2,019,385) |  |  |
Sale for other cryptocurrencies | item | (12) | (12) |  |  |
End of the year | item | 228,601 | 228,601 |  |  |
Balance of Cryptocurrencies | item | 228,601 |  |  |  | 228,601
Cryptocurrencies |  |  |  |  |
Receipt of from Cryptocurrency mining | ¥ 15,933 |  |  |  |
Receipt from exchange of other cryptocurrencies | 49 |  |  |  |
Payment for operating activities | 14,348 |  |  |  |
Sale of cryptocurrencies for other cryptocurrencies | 0 |  |  |  |
Exchange gain (loss) for RMB/USD translation | (27) |  |  |  |
End of the year | 1,607 |  |  |  |
Balance of Cryptocurrencies | ¥ 1,607 |  |  |  |

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