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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2018
Income Tax Disclosure [Line Items] |  |  |  |  |
Valuation allowance, deferred tax assets | $ 43,329,000 | $ 37,856,000 |  |  |
Research and development tax credit carryforwards | 36,041,000 | 29,046,000 |  |  |
Accrued interest | 3,246,000 | 2,297,000 | $ 2,070,000 |  | $ 1,462,000
Net interest expense | 19,000 | 17,000 | $ 7,000 |  |
Potential payment of interest | 52,000 | 58,000 |  |  |
Stock-based compensation | 2,341,000 | 1,796,000 |  |  |
Maximum [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Stock-based compensation | 55,300,000 | $ 49,500,000 |  |  |
Domestic Tax Authority [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Federal net operating loss carryforwards expiry, beginning year |  |  |  | 2025 |
Research and development tax credit carryforwards |  |  |  | $ 13,970,000 |
Domestic Tax Authority [Member] | Tax Year 2017 [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Net operating loss carryforwards | $ 25,963,000 |  |  |  |
Certain States [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Federal net operating loss carryforwards expiry, beginning year |  |  |  | 2021 |
Research and development tax credit carryforwards |  |  |  | $ 24,807,000 |
VICR Certain States Member [Member] | Tax Year 2017 [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Federal net operating loss carryforwards expiry, beginning year | 2025 |  |  |  |
Net operating loss carryforwards | $ 24,804,000 |  |  |  |

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