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Income Taxes - Tax rates (Details)
12 Months Ended
Nov. 30, 2018
Apr. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes          
Statutory tax rate (as a percent)     25.00% 25.00% 25.00%
Hong Kong          
Income Taxes          
Statutory tax rate (as a percent)     16.50%    
Withholding tax rate (as a percent)     0.00%    
PRC          
Income Taxes          
Statutory tax rate (as a percent)     25.00%    
Withholding tax rate (as a percent)     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%