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Share-Based Payment Awards - Compensation Expense from Stock-Based Payment Awards (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Stock-based compensation expense | $ 7,447 | $ 5,547
Research and Development Expense [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Stock-based compensation expense | 2,294 | 1,411
Sales and Marketing [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Stock-based compensation expense | 1,187 | 907
General and Administrative Expense [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Stock-based compensation expense | $ 3,966 | $ 3,229

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