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TRADE RECEIVABLES - An aging analysis of the Company's trade receivables (Details) - CNY (¥)
¥ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables ¥ 58,782 ¥ 101,470
Within 90 days    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables 18,982 34,309
Between 3 and 6 months    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables 4,935 52,477
More than 6 months    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables ¥ 34,865 ¥ 14,684