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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 | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation expense | $ 1,655 | $ 1,454 | $ 3,446 | $ 3,313
Tax benefit for expense associated with stock options, PSUs, RSUs and restricted stock | (394) | (332) | (821) | (775)
Total stock-based compensation expense, net of tax | 1,261 | 1,122 | 2,625 | 2,538
Stock-based Compensation Expense Included in Cost of Sales [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation expense | 87 | 85 | 202 | 189
Selling, General and Administrative Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation expense | 971 | 662 | 2,046 | 1,725
Research and Development Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation expense | 597 | 707 | 1,198 | 1,399
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 | $ 1,568 | $ 1,369 | $ 3,244 | $ 3,124

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