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v3.26.1

TAXATION - Value-added taxes ("VAT") (Details) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2019 | Dec. 31, 2025 CNY (¥) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
TAXATION |  |  |  |  |
Change in fair value of derivative liability |  |  |  | ¥ 166 | ¥ 5,207
Net proceeds from issuance of debt |  | ¥ 94,825 | $ 13,560 | 1,767,174 | 110,000
Repayment of debt |  | ¥ 433,538 | $ 61,995 | ¥ 1,391,219 | ¥ 7,561
Property leasing arrangement |  |  |  |  |
TAXATION |  |  |  |  |
Value added tax | 13.00% |  |  |  |
Technical service |  |  |  |  |
TAXATION |  |  |  |  |
Value added tax |  | 6.00% | 6.00% |  |

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