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Employee Stock Plans - Schedule of Stock-Based Compensation Awards (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Compensation And Retirement Disclosure [Abstract] |  |  |  |
Stock options | $ 615 | $ 425 | $ 1,403 | $ 1,423
Restricted stock units and awards | 1,266 | 1,146 | 3,761 | 3,228
Performance share units | 604 | 288 | 1,601 | 607
Total stock-based compensation expense | $ 2,485 | $ 1,859 | $ 6,765 | $ 5,258

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