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Revenues- Contract balances (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Revenues        
Customer advances and deferred revenues $ 87,042 ¥ 605,970 $ 191,482  
Payable to merchants $ 16,742 116,557 $ 72,939  
Customer liability   ¥ 219,017   ¥ 83,639