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Stock Based Compensation - Summary of Stock-Based Compensation Expense Recognized (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |
Total stock-based compensation |  | $ 89 | $ 346 | $ 299 | $ 861
Research and development |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |
Total stock-based compensation |  | 1 | 83 | 67 | 211
General and Administrative |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |
Total stock-based compensation | [1] | $ 88 | $ 263 | $ 232 | $ 650
[1] | No shares of common stock were issued to Board members for the three and six months ended June 30, 2023.

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