XML 75 R64.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Shares      
Outstanding at beginning of period (in shares)   5,997,372  
Granted (in shares)   577,690  
Forfeited (in shares)   (191,890)  
Exercised (in shares)   (1,562,590)  
Expired (in shares)   (2,893)  
Outstanding at end of period (in shares) 4,817,689 4,817,689 5,997,372
Vested and exercisable at end of period, vested (in shares) 3,313,087 3,313,087  
Vested and exercisable at end of period, exercisable (in shares) 3,313,087 3,313,087  
Weighted average exercise price      
Outstanding at beginning of period (in dollars per share)   $ 10.18  
Granted (in dollars per share)   34.77  
Forfeited (in dollars per share)   18.75  
Exercised (in dollars per share)   7.34  
Expired (in dollars per share)   13.79  
Outstanding at end of period (in dollars per share) $ 13.70 13.70 $ 10.18
Vested and exercisable at end of period, vested (in dollars per share) 10.34 10.34  
Vested and exercisable at end of period, exercisable (in dollars per share) $ 10.34 $ 10.34  
Weighted Average Remaining Contractual Term      
Outstanding   6 years 11 months 5 days 7 years 3 months 18 days
Vested and exercisable at end of period, vested (in years)   6 years 3 months 11 days  
Vested and exercisable at end of period, exercisable (in years)   6 years 3 months 11 days  
Aggregate Intrinsic Value      
Outstanding $ 107,478 $ 107,478 $ 145,270
Vested and exercisable at end of period, vested 84,939 84,939  
Vested and exercisable at end of period, exercisable 84,939 84,939  
Total intrinsic value os stock $ 6,025 $ 47,915  
Common stock      
Aggregate Intrinsic Value      
Fair value per share (in dollars per share) $ 35.98 $ 35.98