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Related party transactions (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Related party transactions          
Purchase of goods ¥ 340,365 ¥ 213,350 ¥ 155,093    
Purchase of services 317,921 1,001 1,475    
Purchase of logistic services     137,088    
Provision of services ¥ 6,300 1,825 ¥ 1,773    
Amounts due from related parties   10,191   $ 2,542 ¥ 17,475
Amounts due to related parties   ¥ 65,022   $ 46,994 ¥ 323,108