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Supplemental Information - Summary of Certain Statements of Operations Amounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Stock-based compensation expenses | $ 4,971 | $ 9,175 | $ 4,385
Depreciation and amortization expenses | 1,869 | 1,607 | 1,081
Research and Development [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Stock-based compensation expenses | 1,132 | 2,190 | 629
Selling and Supply Chain [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Stock-based compensation expenses | (461) | 767 | 408
General and Administrative Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Stock-based compensation expenses | $ 4,300 | $ 6,218 | $ 3,348

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