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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Shares      
Outstanding at beginning of period (in shares) 5,997,372    
Granted (in shares) 534,262 0  
Forfeited (in shares) (35,008)    
Exercised (in shares) (1,096,999)    
Expired (in shares) (2,893)    
Outstanding at end of period (in shares) 5,396,734   5,997,372
Vested, exercisable, expected to vest (in shares) 5,396,734    
Exercisable (in shares) 3,188,518    
Weighted average exercise price      
Outstanding at beginning of period (in dollars per share) $ 10.18    
Granted (in dollars per share) 34.39    
Forfeited (in dollars per share) 12.58    
Exercised (in dollars per share) 6.86    
Expired (in dollars per share) (13.79)    
Outstanding at end of period (in dollars per share) 13.23   $ 10.18
Vested, exercisable, expected to vest (in dollars per share) 13.23    
Exercisable (in dollars per share) $ 9.95    
Weighted Average Remaining Contractual Term      
Outstanding 7 years 6 months 22 days   7 years 3 months 18 days
Vested, exercisable, expected to vest 7 years 6 months 22 days    
Exercisable (in years) 6 years 11 months 27 days    
Aggregate Intrinsic Value      
Outstanding $ 153,263   $ 145,270
Vested, exercisable, expected to vest 153,263    
Exercisable 101,004    
Total intrinsic value of options exercised $ 33,482    
Common stock      
Aggregate Intrinsic Value      
Fair value of stock (in dollars per share) $ 41.63