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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Line Items] |  |  |  |
Provisional tax benefit due to new Tax Act |  |  |  | $ 122,000
Untaxed accumulated unremitted foreign earnings |  |  |  | 813,000
Valuation allowance, deferred tax assets | $ 37,856,000 | $ 30,363,000 |  |
Research and development tax credit carryforwards | 29,046,000 | 27,607,000 |  |
Accrued interest | 2,297,000 | 2,070,000 | $ 1,462,000 | $ 1,104,000
Net interest expense | 17,000 | 7,000 | $ 7,000 |
Potential payment of interest | 58,000 | 41,000 |  |
Stock-based compensation | 1,796,000 | $ 1,587,000 |  |
Maximum [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Stock-based compensation | 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 |  |  |  | $ 11,344,000
Domestic Tax Authority [Member] | Tax Year 2017 [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Net operating loss carryforwards | $ 24,990,000 |  |  |
Certain States [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Federal net operating loss carryforwards expiry, beginning year |  |  |  | 2020
Research and development tax credit carryforwards |  |  |  | $ 19,423,000
VICR Certain States Member [Member] | Tax Year 2017 [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Federal net operating loss carryforwards expiry, beginning year | 2024 |  |  |
Net operating loss carryforwards | $ 10,241,000 |  |  |

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