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Summary of significant accounting policies (Details 2) - CNY (¥)
¥ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items]        
Cash and cash equivalents ¥ 3,188 ¥ 21,717 ¥ 96,791 ¥ 65,741
Loan receivables 579,654 ¥ 791,390    
IAS 39 [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Cash and cash equivalents 21,717      
Interest receivables 39,628      
Loan receivables 791,390      
Total carrying amounts of financial assets 852,735      
Reclassification [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Cash and cash equivalents      
Interest receivables      
Loan receivables      
Total carrying amounts of financial assets      
Remeasurements [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Cash and cash equivalents      
Interest receivables (28,308)      
Loan receivables (205,738)      
Total carrying amounts of financial assets (234,046)      
IAS 9 [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Cash and cash equivalents 21,717      
Interest receivables 11,320      
Loan receivables 585,652      
Total carrying amounts of financial assets ¥ 618,689