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TRADE RECEIVABLES - An aging analysis of the Company's trade receivables (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables ¥ 101,470 ¥ 177,023
Within 90 days    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables 34,309 35,846
Between 3 and 6 months    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables 52,477 72,241
More than 6 months    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables ¥ 14,684 ¥ 68,936