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Summary of Stock-Based Compensation Recognized (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] |  |  |
Total stock-based compensation |  | $ 1,026 | $ 805
Research and development |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total stock-based compensation |  | 369 | 344
General and Administrative |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total stock-based compensation | [1] | $ 657 | $ 461
[1] | Included in general and administrative stock-based compensation for the three months ended March 31, 2021 is expense related to 10,149 shares of common stock issued to certain board members in lieu of their cash compensation

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