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Stock Incentive Plans - Summary of Expense Relating to Employee and Nonemployee Stock-Based Payment Awards from Stock Options and RSUs (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share based compensation total expensed | $ 6,547 | $ 4,259
Cost of testing services |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share based compensation total expensed | 395 | 247
Cost of product |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share based compensation total expensed | 76 | 59
Cost of digital and other |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share based compensation total expensed | 108 | 59
Research and development |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share based compensation total expensed | 1,358 | 810
Sales and Marketing |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share based compensation total expensed | 1,659 | 971
General and administrative |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share based compensation total expensed | $ 2,951 | $ 2,113

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