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Market risk (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Market Risk Details        
Cash and cash equivalents ¥ 21,717 ¥ 96,791 ¥ 65,741 ¥ 15,270
Loan receivables 791,390 675,341    
Total Assets subject to market risk 813,107 772,132    
Loan payable ¥ 226,370 ¥ 200,470