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Stockholders' equity - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Shares    
Outstanding at beginning of period (shares) 25,134  
Granted (shares) 527  
Exercised (shares) (12,027)  
Forfeited/Cancelled (shares) (249)  
Outstanding at end of period (shares) 13,385  
Weighted- average exercise price    
Outstanding at beginning of period (in dollars per share) $ 6.62  
Granted (in dollars per share) 47.37  
Exercised (in dollars per share) 1.97  
Forfeited/Cancelled (in dollars per share) 18.65  
Outstanding at end of period (in dollars per share) $ 12.19  
Aggregate intrinsic value $ 276,067 $ 1,425,339
Exercisable (shares) 8,258  
Exercisable - Weighted average exercise price (in dollars per share) $ 5.48  
Exercisable - Aggregate intrinsic value $ 214,083  
Vested and expected to vest (shares) 13,127  
Vested and expected to vest - Weighted average exercise price (in dollars per share) $ 11.94  
Vested and expected to vest - Aggregate intrinsic value $ 273,232