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CHANGES IN ACCOUNTING POLICIES AND DISCLOSURES (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
CHANGES IN ACCOUNTING POLICIES AND DISCLOSURES        
Weighted average lessee's incremental borrowing rate applied to the lease liabilities   5.75%    
Operating lease commitments disclosed as at December 31, 2018     ¥ 19,695  
Discounted using weighted average incremental borrowing rate of 5.75%   ¥ 15,496    
Lease liabilities recognized as at January 1, 2019   19,380    
Right-of-use assets ¥ 0 17,266 32,619 ¥ 32,619
Lease liability (5,793) (19,380) 0  
Retained earnings ¥ 272,496 ¥ 2,114 ¥ 275,712