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Accounts receivable, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Accounts Receivable Net [Line Items]            
Accounts receivable, gross       ¥ 206,772   ¥ 161,300
Less: allowance for doubtful receivables ¥ (7,356) ¥ (7,356) ¥ (58,791) (8,344)   (7,356)
Accounts receivable, net       ¥ 198,428 $ 28,860 ¥ 153,944
Summary of allowance for doubtful accounts            
Balance at the beginning of the year (7,356) (55,220) (58,791)      
(Additions) reversals charged to general and administrative expenses, net (1,198) (3,049) 3,571      
Write-off during the year 210 50,913 0      
Balance at the end of the year ¥ (8,344) ¥ (7,356) ¥ (55,220)