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Cash and cash equivalents (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash And Cash Equivalents Details        
Cash on hand ¥ 23 ¥ 40    
Cash at bank 21,694 36,751    
Time deposit 60,000    
Cash and cash equivalent per consolidated statements of cash flow ¥ 21,717 ¥ 96,791 ¥ 65,741 ¥ 15,270