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Revenues (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Revenues        
Revenues $ 1,908,223 ¥ 13,119,990 ¥ 1,744,076 ¥ 504,864
Online marketplace services        
Revenues        
Revenues 1,908,223 13,119,990 1,740,691 48,276
Online marketing services        
Revenues        
Revenues 1,674,871 11,515,575 1,209,275  
Transaction services        
Revenues        
Revenues $ 233,352 ¥ 1,604,415 531,416 48,276
Merchandise sales        
Revenues        
Revenues     ¥ 3,385 ¥ 456,588