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COMMITMENTS - Operating lease commitments (Details) - CNY (¥)
¥ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Disclosure of commitments [Line Items]    
Operating lease commitments ¥ 33,213 ¥ 46,729
Within one year    
Disclosure of commitments [Line Items]    
Operating lease commitments 13,745 13,404
After one year and within five years    
Disclosure of commitments [Line Items]    
Operating lease commitments ¥ 19,468 ¥ 33,325