Share-Based Compensation - Summary of Share-Based Compensation Expense by Award Type (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Share-based compensation expense | $ 24,916 | $ 17,597 | $ 44,314 | $ 30,864 |
Options | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Share-based compensation expense | 204 | 836 | 739 | 1,964 |
Restricted stock units | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Share-based compensation expense | 23,669 | 16,014 | 41,633 | 27,418 |
Employee stock purchase plan rights | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Share-based compensation expense | $ 1,043 | $ 747 | $ 1,942 | $ 1,482 |