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Stock Award Plans - Stock Based Compensation Expense Recognized in Accompanying Consolidated Statements of Operations by Category (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share based compensation | $ 6,511 | $ 6,203
Cost of Goods Sold |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share based compensation | 446 | 601
Research and development |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share based compensation | 338 | 356
Selling, General and Administrative Expenses |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share based compensation | 5,101 | 4,508
Cost of Revenue - Collaborations and Services |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share based compensation | $ 626 | $ 738

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