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OPERATING LEASE- Additional information (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Previous Lease Standard ("ASC 840") [Member]    
Lessee, Lease, Description [Line Items]    
Operaitng lease costs ¥ 3,909 ¥ 15,732