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TRADE RECEIVABLES - An aging analysis of the Company's trade receivables (Details) - CNY (¥)
¥ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables ¥ 18,893 ¥ 51,416
Within 90 days    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables 422 81
Between 3 and 6 months    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables 0  
More than 6 months    
Disclosure Of TRADE RECEIVABLES [Line Items]    
Current trade receivables ¥ 18,471 ¥ 51,335