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Share-Based Compensation - Summary of Total Stock Based Compensation Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation expense | $ 3,227 | $ 1,853 | $ 9,482 | $ 5,688
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation expense | 265 | 400 | 963 | 1,260
Restricted Stock Units Settled in Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation expense | $ 2,962 | 1,113 | 8,759 | 2,651
Restricted Stock Units Settled in Cash [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation expense |  | $ 340 | $ (240) | $ 1,777

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