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Accounts receivable, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Jan. 01, 2018
CNY (¥)
Accounts receivable, net              
Accounts receivable, gross         ¥ 763,004 ¥ 206,772  
Less: allowance for doubtful receivables ¥ (986) ¥ (7,356) ¥ (7,356)   (986) (8,344)  
Accounts receivable, net       $ 109,457 ¥ 762,018 ¥ 198,428 ¥ 153,944
Summary of allowance for doubtful accounts              
Balance at the beginning of the year (8,344) (7,356) (55,220)        
Additions charged to general and administrative expenses, net (117) (1,198) (3,049)        
Write-off during the year 7,475 210 50,913        
Balance at the end of the year ¥ (986) ¥ (8,344) ¥ (7,356)