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Accounts receivable, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
Accounts receivable, net          
Subtotal     ¥ 5,792,275   ¥ 1,407,544
Less: allowance for doubtful accounts     (117,544)   (111,778)
Total $ 186,125   5,674,731   1,295,766
Allowance for doubtful accounts:          
Balance at beginning of the year   ¥ (117,544) (124,891) ¥ (46,209)  
Provision for allowance during the year $ (32,970) (229,531) (175,405) (130,862)  
Write-offs during the year   161,008 173,743 32,501  
Balance at end of the year   (111,778) (117,544) (124,891)  
Accounts receivable, net          
Allowance for doubtful accounts:          
Provision for allowance during the year   ¥ (155,242) (166,396) ¥ (111,183)  
Other trade receivables          
Accounts receivable, net          
Subtotal     5,302,391   1,051,707
Collateralized accounts receivables     1,200,000   0
Delivery service providers          
Accounts receivable, net          
Subtotal     297,242   0
Others          
Accounts receivable, net          
Subtotal     ¥ 192,642   ¥ 355,837