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Stock-Based Compensation Expense - Stock Based Compensation Expense Recognized in Accompanying Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock compensation expense | $ 1,935 | $ 1,128
RSUs and Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock compensation expense | 1,826 | 1,066
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock compensation expense | $ 109 | $ 62

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