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Fair value of financial assets and liabilities (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]        
Cash and cash equivalents ¥ 97 ¥ 132 ¥ 3,188 ¥ 21,717
Loan receivables 662,183 615,184    
Fair value [Member]        
Statement [Line Items]        
Cash and cash equivalents 97 132    
Loan receivables 662,183 615,184    
Total financial assets 662,280 615,316    
Loans payable 171,569 172,891    
Carrying amount [member]        
Statement [Line Items]        
Cash and cash equivalents 97 132    
Loan receivables 662,183 615,184    
Total financial assets 662,280 615,316    
Loans payable ¥ 171,569 ¥ 172,891