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FAIR VALUE MEASUREMENTS - Fair value of its derivative liability on a recurring basis using significant unobservable (Level 3) inputs (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
FAIR VALUE MEASUREMENTS      
Derivative liability ¥ 163 $ 23 ¥ 5,290
Significant unobservable inputs (Level 3)      
FAIR VALUE MEASUREMENTS      
Derivative liability ¥ 163