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Fair value of financial assets and liabilities (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]        
Cash, Cash Equivalents And Restricted Cash ¥ 396 ¥ 97 ¥ 132 ¥ 3,188
Loan Receivables 754,393 762,992    
Fair value [Member]        
Statement [Line Items]        
Cash, Cash Equivalents And Restricted Cash 396 97    
Loan Receivables 555,133 662,183    
Total Financial Assets 555,529 662,280    
Loans Payable 161,569 171,569    
Carrying amount [member]        
Statement [Line Items]        
Cash, Cash Equivalents And Restricted Cash 396 97    
Loan Receivables 555,133 662,183    
Total Financial Assets 555,529 662,280    
Loans Payable ¥ 161,569 ¥ 171,569