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Revenues (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Revenues        
Revenues $ 4,329,611 ¥ 30,141,886 ¥ 13,119,990 ¥ 1,744,076
Online marketplace services        
Revenues        
Revenues 4,329,611 30,141,886 13,119,990 1,740,691
Online marketing services        
Revenues        
Revenues 3,851,539 26,813,641 11,515,575 1,209,275
Transaction services        
Revenues        
Revenues $ 478,072 ¥ 3,328,245 ¥ 1,604,415 531,416
Merchandise sales        
Revenues        
Revenues       ¥ 3,385