XML 46 R36.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock-based Compensation - Summary of Activity for Options Vest Solely Based upon Satisfaction of Service Condition (Details) - Service-based Vesting Options
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Options outstanding, Beginning balance | shares 3,168,967
Options outstanding, Granted | shares 205,300
Options outstanding, Exercised | shares (379,214)
Options outstanding, Forfeited | shares (141,331)
Options outstanding, Ending balance | shares 2,853,722
Options outstanding, Exercisable | shares 1,098,328
Weighted-average exercise price, Beginning balance | $ / shares $ 8.55
Weighted-average exercise price, Granted | $ / shares 26.53
Weighted-average exercise price, Exercised | $ / shares 1.94
Weighted-average exercise price, Forfeited | $ / shares 17.58
Weighted-average exercise price, Ending balance | $ / shares 10.28
Weighted-average exercise price, Exercisable | $ / shares $ 4.67
Weighted-average remaining contractual life (in years), Outstanding 8 years 1 month 17 days
Weighted-average remaining contractual life(in years), Exercisable 6 years 11 months 9 days
Aggregate intrinsic values, Outstanding | $ $ 35,748
Aggregate intrinsic values, Exercisable | $ $ 19,637