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TRADE RECEIVABLES - An aging analysis of the Company's trade receivables (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables ¥ 177,023 ¥ 224,114
Within 90 days    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables 35,846 57,785
Between 3 and 6 months    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables 72,241 69,037
More than 6 months    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables ¥ 68,936 ¥ 97,292