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FINANCIAL RISK MANAGEMENT - Liquidity risk (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of financial risk management [Line Items]    
Trade payables ¥ 22,577 ¥ 24,329
Amounts owed to related parties 36,217  
Interest-bearing bank borrowings 0 0
Total 58,794 60,532
Within one year    
Disclosure Of financial risk management [Line Items]    
Trade payables 22,577 24,329
Amounts owed to related parties 36,217 36,203
Interest-bearing bank borrowings 0 0
Total 58,794 60,532
More than 1 year but less than 3 years [member]    
Disclosure Of financial risk management [Line Items]    
Trade payables 0 0
Amounts owed to related parties 0 0
Interest-bearing bank borrowings 0 0
Total 0 0
Total contractual undiscounted cash flow [member]    
Disclosure Of financial risk management [Line Items]    
Trade payables 22,577 24,329
Amounts owed to related parties 36,217 36,203
Interest-bearing bank borrowings 0 0
Total ¥ 58,794 ¥ 60,532