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Stock-Based Compensation - Stock-Based Compensation Expense Related to Stock Options, PSUs, RSUs and Restricted Stock (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total stock-based compensation expense | $ 6,962 | $ 7,155 | $ 7,433
Tax benefit for expense associated with non-qualified options, PSUs, RSUs and restricted stock | (1,659) | (1,432) | (1,699)
Total stock-based compensation expense, net of tax | 5,303 | 5,723 | 5,734
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 | 369 | 418 | 379
Selling, General and Administrative Expense [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total stock-based compensation expense | 3,889 | 3,989 | 4,063
Research and Development Expense [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total stock-based compensation expense | 2,704 | 2,748 | 2,991
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 | $ 6,593 | $ 6,737 | $ 7,054

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