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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
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Mar. 31, 2020 | Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Total stock-based compensation expense | $ 1,791 | $ 1,859
Tax benefit for expense associated with stock options, PSUs, RSUs and restricted stock | (427) | (443)
Total stock-based compensation expense, net of tax | 1,364 | 1,416
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 | 115 | 104
Selling, General and Administrative Expense [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Total stock-based compensation expense | 1,075 | 1,063
Research and Development Expense [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Total stock-based compensation expense | 601 | 692
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 | $ 1,676 | $ 1,755

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