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Stock-based Compensation - Summary of Activity for Options Vest Based upon Performance or Market Conditions (Details) - Performance-based and Market-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 3,836,107
Options outstanding, Granted | shares 463,200
Options outstanding, Exercised | shares (1,711,381)
Options outstanding, Forfeited | shares (43,350)
Options outstanding, Ending balance | shares 2,544,576
Weighted-average exercise price, Beginning balance | $ / shares $ 2.46
Weighted-average exercise price, Granted | $ / shares 27.02
Weighted-average exercise price, Exercised | $ / shares 2.71
Weighted-average exercise price, Forfeited | $ / shares 27.29
Weighted-average exercise price, Ending balance | $ / shares $ 6.33
Weighted-average remaining contractual life (in years), Outstanding 7 years 6 months 22 days
Aggregate intrinsic values, Outstanding | $ $ 43,083