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Common shares and treasury shares (Narrative) (Details)
$ / shares in Units, ¥ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Jan. 31, 2020
CNY (¥)
Jan. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Common shares [Line Items]            
Number of shares repurchased     434,145      
Average price per ADS | $ / shares     $ 54.6194      
Aggregate consideration | $     $ 23.7      
Purchase of a capped call option | $     $ 11.7      
Initial investment returned ¥ 84.8 $ 12.2        
Class A common shares            
Common shares [Line Items]            
Common shares, shares authorized     10,000,000,000 10,000,000,000 10,000,000,000  
Common shares, shares issued     1,301,845,404 981,740,848 945,245,908  
Common shares, shares outstanding     1,293,162,504 981,740,848 945,245,908  
Number of shares repurchased     8,682,900      
Average price per share | $ / shares     $ 2.7310      
Class A common shares | Bigo Inc            
Common shares [Line Items]            
Issuance of common stock for acquisition (in shares)     305,127,046      
Class B common shares            
Common shares [Line Items]            
Common shares, shares authorized     1,000,000,000 1,000,000,000 1,000,000,000  
Common shares, shares issued     326,509,555 288,182,976 317,982,976  
Common shares, shares outstanding     326,509,555 288,182,976 317,982,976  
Class B common shares | Bigo Inc            
Common shares [Line Items]            
Issuance of common stock for acquisition (in shares)     38,326,579      
Restricted shares | Class A common shares            
Common shares [Line Items]            
Issuance of common share (in shares)     6,216,060 6,694,940 21,305,880  
common Stock | Class A common shares            
Common shares [Line Items]            
Issuance of common share (in shares)         132,250,000  
Common shares, shares outstanding     1,293,162,504 981,740,848 945,245,908 750,115,028
Issuance of common stock for acquisition (in shares)     305,127,046      
common Stock | Class B common shares            
Common shares [Line Items]            
Conversion of Stock, Shares Converted       29,800,000 41,575,000  
Common shares, shares outstanding     326,509,555 288,182,976 317,982,976 359,557,976
Issuance of common stock for acquisition (in shares)     38,326,579