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TRADE RECEIVABLES - An aging analysis of trade receivables that were neither past due nor impaired or past due but not impaired (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables ¥ 177,023 ¥ 224,114
Financial assets past due but not impaired [member]    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables 0 0
Financial assets past due but not impaired [member] | Not later than one month    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables 35,846 97,291
Financial assets past due but not impaired [member] | Later than one month and not later than four months [Member]    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables 0 0
Financial assets past due but not impaired [member] | Later than four months [member]    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables 0 0
Financial assets neither past due nor impaired [member]    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables ¥ 141,177 ¥ 126,823