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Accounts receivable, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2016
USD ($)
Accounts receivable ¥ 625,997 ¥ 365,452  
Allowance for doubtful accounts:      
Balance at beginning of the year (670) (408)  
Additions (510) (650)  
Write-offs  
Reversal 388  
Balance at end of the year (1,180) (670)  
Accounts receivable, net ¥ 624,817 ¥ 364,782 $ 89,993