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Income Taxes - Tax rates (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Nov. 30, 2018
Apr. 30, 2018
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
Dec. 31, 2016
Income Taxes            
Statutory tax rate (as a percent)     25.00% 25.00% 25.00% 25.00%
Preferential tax rate     $ 28,773 ¥ 197,828    
Hong Kong            
Income Taxes            
Statutory tax rate (as a percent)     16.50% 16.50%    
Withholding tax rate (as a percent)     0.00% 0.00%    
PRC            
Income Taxes            
Statutory tax rate (as a percent)     25.00% 25.00%    
Withholding tax rate (as a percent)     10.00% 10.00%    
Xinzhijiang | PRC            
Income Taxes            
Preferential tax rate (as a percent)   15.00%        
Shanghai Xunmeng | PRC            
Income Taxes            
Preferential tax rate (as a percent) 15.00%