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Liquidity risk (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financial assets        
Cash and cash equivalents ¥ 21,717 ¥ 96,791 ¥ 65,741 ¥ 15,270
Loan receivables 791,390 675,341    
Total 813,107 772,132    
Financial liabilities        
Loans payable 226,370 200,470    
Less than 1 month [Member]        
Financial assets        
Cash and cash equivalents 21,717 96,791    
Loan receivables 75,460 149,009    
Total 97,177 245,800    
Financial liabilities        
Loans payable 34,048 8,290    
1 - 3 months [Member]        
Financial assets        
Cash and cash equivalents    
Loan receivables 115,621 118,827    
Total 115,621 118,827    
Financial liabilities        
Loans payable 48,219 70,057    
3 months to 1 year [Member]        
Financial assets        
Cash and cash equivalents    
Loan receivables 668,106 470,639    
Total 668,106 470,639    
Financial liabilities        
Loans payable 156,549 129,755    
Carrying amount [Member]        
Financial assets        
Cash and cash equivalents 21,717 96,791    
Loan receivables 791,390 675,341    
Total 813,107 772,132    
Financial liabilities        
Loans payable ¥ 226,370 ¥ 200,470