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Stockholders' Equity - Stock-based Compensation Expenses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Stock-based compensation | $ 520 | $ 745 | $ 1,257 | $ 1,463
General and Administrative Expense [Member] |  |  |  |
Stock-based compensation | 348 | 494 | 825 | 1,039
Research and Development Expense [Member] |  |  |  |
Stock-based compensation | $ 172 | $ 251 | $ 432 | $ 424

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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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