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COMMITMENTS - Operating lease commitments (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of commitments [Line Items]      
Operating lease commitments ¥ 5,792 ¥ 19,694 ¥ 33,596
Within one year      
Disclosure of commitments [Line Items]      
Operating lease commitments 5,792 13,902 13,902
After one year and within five years      
Disclosure of commitments [Line Items]      
Operating lease commitments ¥ 0 ¥ 5,792 ¥ 19,694