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Stock-Based Compensation - ESPP - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 01, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Stock-Based Compensation |  |  |  |  |
Stock-based compensation expense |  | $ 23,934 | $ 21,057 | $ 46,899 | $ 36,926
ESPP |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Stock-based compensation expense |  | $ 6,300 | $ 6,400 | $ 14,100 | $ 10,400
Number of additional shares authorized for grant | 0.5 |  |  |  |

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