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Employee Stock Plans - Schedule of Stock-Based Compensation Awards (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Compensation And Retirement Disclosure [Abstract] |  |  |  |
Stock options | $ 367 | $ 479 | $ 788 | $ 998
Restricted stock units and awards | 1,324 | 1,153 | 2,495 | 2,082
Performance share units | 566 | 285 | 997 | 319
Total stock-based compensation expense | $ 2,257 | $ 1,917 | $ 4,280 | $ 3,399

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