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Share-based compensation (Number of share options granted to Huya's employees) (Details) - Huya 2017 Share Incentive Plan [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Number of options    
Balance ,options 11,719,705 0 [1]
Granted (in shares) 6,138,353 11,737,705
Forfeited (in shares) (75,000) (18,000)
Cancelled (262,503)  
Balance ,options 17,520,555 11,719,705
Expected to vest (in shares) 13,982,830  
Exercisable as of December 31, 2018 2,736,927  
Weighted average exercise price    
Balance $ 2.5500 $ 0
Granted (in dollars per share) 2.4672 2.5500
Forfeited (in dollars per share) 2.5500 2.5500
Cancelled 2.5500  
Balance ,weighted average exercise price 2.5210 $ 2.5500
Expected to vest (in dollars per share) 2.5338  
Exercisable as of December 31, 2018 $ 2.4572  
Weighted average remaining contractual life (years)    
Balance 8 years 9 months 25 days 9 years 9 months
Expected to vest 8 years 10 months 13 days  
Exercisable 8 years 7 months 17 days  
Aggregate intrinsic value [Abstract]    
Balance $ 227,049 $ 2,227
Expected to vest 181,024  
Exerisable $ 35,642  
[1] The risk-free interest rate of periods within the contractual life of the share option is based on US Treasury Bonds of similar tenor at the valuation dates.