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RIGHT-OF-USE ASSETS AND LEASES LIABILITIES - Lease liabilities (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2019
RIGHT-OF-USE ASSETS AND LEASES LIABILITIES      
Lease liabilities - current ¥ 13,404 ¥ 13,431 ¥ 19,380
Lease liabilities - noncurrent 33,325 46,728  
Total lease liabilities ¥ 46,729 ¥ 60,159 ¥ 19,380