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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Line Items] |  |  |  |
Tax benefit recognized |  |  | $ 0 |
AMT credit carryforwards |  |  | 736,000 |
Provisional tax benefit due to new Tax Act |  |  | 122,000 |
Untaxed accumulated unremitted foreign earnings |  |  | 813,000 |
Valuation allowance, deferred tax assets | $ 30,363,000 | $ 30,031,000 |  |
Research and development tax credit carryforwards | 27,607,000 | 23,244,000 |  |
Accrued interest | 2,070,000 | 1,462,000 | 1,104,000 | $ 946,000
Net interest expense | 7,000 | 7,000 | $ 6,000 |
Potential payment of interest | $ 41,000 | $ 35,000 |  |
Minimum [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Effective income tax rate |  | 21.00% |  |
Maximum [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Effective income tax rate |  |  | 35.00% |
Domestic Tax Authority [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Federal net operating loss carryforwards expiry, beginning year |  |  | 2025 |
Research and development tax credit carryforwards |  |  | $ 14,451,000 |
Certain States [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Federal net operating loss carryforwards expiry, beginning year |  |  | 2022 |
Federal net operating loss carryforwards expiry, ending year |  |  | 2037 |
Research and development tax credit carryforwards |  |  | $ 17,744,000 |
Net operating loss carryforwards |  |  | $ 4,913,000 |

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