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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, 2021
Dec. 31, 2020
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables ¥ 51,416 ¥ 101,470
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 0 34,309
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 51,335 0
Financial assets neither past due nor impaired [member]    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables ¥ 81 ¥ 67,161