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EMPLOYEE DEFINED CONTRIBUTION PLAN (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
PRC |  |  |  |
EMPLOYEE DEFINED CONTRIBUTION PLAN |  |  |  |
Contributions to defined contribution plans | ¥ 45,808 | $ 6,276 | ¥ 57,182 | ¥ 58,623

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