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Fair value of financial assets and liabilities (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement [Line Items]        
Cash and cash equivalents ¥ 132 ¥ 3,188 ¥ 21,717 ¥ 96,791
Loan receivables 615,184 579,654    
Fair value [Member]        
Statement [Line Items]        
Cash and cash equivalents 132 3,188    
Loan receivables 615,184 578,063    
Total financial assets 615,316 581,251    
Loans payable 172,891 203,837    
Carrying amount [Member]        
Statement [Line Items]        
Cash and cash equivalents 132 3,188    
Loan receivables 615,184 579,654    
Total financial assets 615,316 582,842    
Loans payable ¥ 172,891 ¥ 200,417