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Taxation - Sales tax (Details)
 6 Months Ended 12 Months Ended 18 Months Ended
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2020
Services rendered        
Sales tax        
Value added tax rate (as a percent)   6.00%    
Goods sold | Minimum        
Sales tax        
Value added tax rate (as a percent)   0.00%    
Goods sold | Maximum        
Sales tax        
Value added tax rate (as a percent)   17.00%    
Advertising And Marketing Revenues        
Sales tax        
Culture business construction fee percentage 3.00%   3.00% 1.50%
Culture business construction fee rate date up to which the prevailing rate is applicable   Dec. 31, 2024