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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Line Items] |  |
Income tax benefits | $ 0 | $ 0
Net operating loss carryforwards, federal | 174,028,000 |
Net operating loss carryforwards, state | 192,346,000 |
Increase in valuation allowance | 14,276,000 | 23,307,000
Unrecognized tax benefits | $ 0 | $ 0
Description of income tax examinations | There are currently no pending tax examinations. |
Tax Cuts and Jobs Act of 2017, description of corporate tax payers | Corporate taxpayers may carryback NOLs originating during 2018 through 2020 for up to five years, which was not previously allowed under the 2017 Tax Act. The CARES Act also eliminates the 80% of taxable income limitations by allowing corporate entities to fully utilize NOL carryforwards to offset taxable income in 2018, 2019 or 2020. Taxpayers may generally deduct interest up to the sum of 50% of adjusted taxable income plus business interest income (30% limit under the 2017 Tax Act) for tax years beginning January 1, 2019 and 2020. The CARES Act allows taxpayers with alternative minimum tax credits to claim a refund in 2020 for the entire amount of the credits instead of recovering the credits through refunds over a period of years, as originally enacted by the 2017 Tax Act. |
CARES Act, percentage of eliminates of taxable income | 80.00% |
Tax Cuts and Jobs Act of 2017, maximum percentage of interest deducted by tax payers | 50.00% |
CARES Act, percentage of interest deducted by tax payers | 30.00% |
CARES Act, percentage of corporate charitable deduction limit | 25.00% |
CARES Act, period of qualified improvement property for cost-recovery | 15 years |
CARES Act, percentage of bonus depreciation | 100.00% |
Maximum [Member] |  |
Income Tax Disclosure [Line Items] |  |
Net operating loss carryback period | 5 years |
Federal [Member] |  |
Income Tax Disclosure [Line Items] |  |
Income tax benefits | $ 0 |
Net operating loss carryforwards, subject to expiration | 43,127,000 |
Net operating loss carryforwards, not subject to expiration | $ 130,901,000 |
Net operating loss carryforwards, beginning to expiring year | 2035 |
Research and development tax credit carryforwards | $ 8,139,000 |
Research and development tax credit carryforwards, expiration year | 2035 |
State [Member] |  |
Income Tax Disclosure [Line Items] |  |
Income tax benefits | $ 0 |
Net operating loss carryforwards, beginning to expiring year | 2035 |
Research and development tax credit carryforwards | $ 2,699,000 |
Research and development tax credit carryforwards, expiration year | 2030 |

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