Stock-based Compensation - Expense Related to Stock Options (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
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Dec. 31, 2020 |
Dec. 31, 2019 |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
| Stock-based compensation expense related to stock options | $ 2,220 | $ 1,828 |
| Research and development, net | ||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
| Stock-based compensation expense related to stock options | 806 | 604 |
| Selling, general and administrative | ||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
| Stock-based compensation expense related to stock options | $ 1,414 | $ 1,224 |
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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