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FINANCIAL RISK MANAGEMENT - Liquidity risk (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of financial risk management [Line Items]    
Trade payables ¥ 6,290 ¥ 6,750
Amounts owed to related parties 36,348 36,348
Lease liabilities 49,448 64,947
Total 92,086 108,045
Within one year    
Disclosure Of financial risk management [Line Items]    
Trade payables 6,290 6,750
Amounts owed to related parties 36,348 36,348
Lease liabilities 14,883 15,478
Total 57,521 58,576
More than 1 year but less than 3 years [member]    
Disclosure Of financial risk management [Line Items]    
Lease liabilities 34,565  
Total 34,565 49,469
Total contractual undiscounted cash flow [member]    
Disclosure Of financial risk management [Line Items]    
Trade payables 6,290 6,750
Amounts owed to related parties 36,348 36,348
Lease liabilities 49,448 49,469
Total ¥ 92,086 ¥ 108,045