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v3.25.1

TAXATION (Details) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2019 | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
TAXATION |  |  |  |  |  |  |  |  |
Applicable tax rates |  | 25.00% | 25.00% | 25.00% | 25.00% | 25.00% |  |  |
Current income tax for federal and state for US Proton |  | ¥ (2,183) | $ (299) | ¥ 404 | ¥ 196 |  |  |  |
Withholding tax rate |  | 10 | 10 |  |  |  |  |  |
Net operating loss carryforwards |  | ¥ 2,164,982 |  |  |  |  |  | $ 296,601 |
Unrecognized tax benefits |  | 67,799 |  | 63,899 | 67,172 |  |  | 9,287 | $ 8,754
Unrecognized tax benefits, net deferred tax asset related to tax loss carryforwards |  | 32,728 |  | 28,712 |  |  |  | 4,484 |
Unrecognized tax benefits which affect the annual effective tax rate |  | 36,036 |  | 35,421 |  |  |  | 4,937 |
Uncertain tax position, impact on taxes |  | 2,473 | $ 339 | 6,121 | ¥ 7,254 |  |  |  |
Accrued interest and penalties |  | ¥ 9,433 |  | ¥ 9,283 |  |  |  | $ 1,292 |
Property leasing arrangement |  |  |  |  |  |  |  |  |
TAXATION |  |  |  |  |  |  |  |  |
Value added tax | 13.00% |  |  |  |  |  |  |  |
Technical service |  |  |  |  |  |  |  |  |
TAXATION |  |  |  |  |  |  |  |  |
Value added tax |  | 6.00% | 6.00% |  |  |  |  |  |
United States |  |  |  |  |  |  |  |  |
TAXATION |  |  |  |  |  |  |  |  |
Applicable tax rates |  | 21.00% | 21.00% | 21.00% | 21.00% | 21.00% |  |  |
Singapore |  |  |  |  |  |  |  |  |
TAXATION |  |  |  |  |  |  |  |  |
Income tax profits | $ |  |  |  |  |  | $ 0 | $ 0 |  |
Hong Kong |  |  |  |  |  |  |  |  |
TAXATION |  |  |  |  |  |  |  |  |
Income tax profits | ¥ |  | ¥ 0 |  |  |  |  |  |  |

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