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Employee benefit plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Shares    
Outstanding at beginning of period (shares) 25,134  
Granted (shares) 792  
Exercised (shares) (12,375)  
Forfeited/Cancelled (shares) (470)  
Outstanding at end of period (shares) 13,081 25,134
Weighted- average exercise price    
Outstanding at beginning of period (in dollars per share) $ 6.62  
Granted (in dollars per share) 39.66  
Exercised (in dollars per share) 2.01  
Forfeited/Cancelled (in dollars per share) 38.84  
Outstanding at end of period (in dollars per share) $ 11.82 $ 6.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 8 months 12 days 7 years 1 month 2 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 108,846 $ 1,425,339
Exercisable (shares) 8,449  
Exercisable - Weighted average exercise price (in dollars per share) $ 6.19  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 10 months 21 days  
Exercisable - Aggregate intrinsic value $ 103,696  
Vested and expected to vest (shares) 12,858  
Vested and expected to vest - Weighted average exercise price (in dollars per share) $ 11.62  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term 6 years 8 months 1 day  
Vested and expected to vest - Aggregate intrinsic value $ 108,681