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Stock-Based Compensation - Stock-Based Compensation Expense Related to Stock Options, PSUs, RSUs and Restricted Stock (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation expense | $ 1,842 | $ 1,610 | $ 5,457 | $ 5,056
Tax benefit for expense associated with stock options, PSUs, RSUs and restricted stock | (460) | (384) | (1,343) | (1,205)
Total stock-based compensation expense, net of tax | 1,382 | 1,226 | 4,114 | 3,851
Stock-based Compensation Expense Included in Cost of Revenue [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation expense | 133 | 101 | 389 | 303
Selling, General and Administrative Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation expense | 1,116 | 953 | 3,312 | 2,999
Research and Development Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation expense | 593 | 556 | 1,756 | 1,754
Stock-based Compensation Expense Included in Operating Expenses [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation expense | $ 1,709 | $ 1,509 | $ 5,068 | $ 4,753

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