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COMMITMENTS - Operating lease commitments (Details) - CNY (¥)
¥ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Disclosure of commitments [Line Items]    
Operating lease commitments ¥ 46,212 ¥ 60,159
Not later than one month [member]    
Disclosure of commitments [Line Items]    
Operating lease commitments 15,423 13,431
After one year and within five years    
Disclosure of commitments [Line Items]    
Operating lease commitments ¥ 30,789 ¥ 46,728