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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Operating Loss Carryforwards [Line Items] |  |
Income tax expense | $ 0 | $ 0
Foreign taxes | 0 |
Research and development tax credit carry forwards | 6,470,000 | 5,040,000
Interest Expense [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Reserve for uncertain tax positions | 0 | $ 0
State [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carry forwards | 60,700,000 |
Research and development tax credit carry forwards | 2,400,000 |
Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carry forwards | 72,900,000 |
Research and development tax credit carry forwards | 4,500,000 |
Federal [Member] | Expirable [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carry forwards | 9,000,000.0 |
Federal [Member] | Nonexpirable [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carry forwards | $ 63,900,000 |
Annual taxable income, percentage | 80.00% |
Minimum [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Open tax year | 2017 |
Minimum [Member] | State [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carry forwards expiration period | 2027 |
Tax credit carry forward expiration date | 2029 |
Minimum [Member] | Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carry forwards expiration period | 2029 |
Tax credit carry forward expiration date | 2030 |

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