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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Operating Loss Carryforwards [Line Items] |  |
Net loss | $ (22,127,000) | $ (16,306,000)
Income Tax Expense (Benefit) | 0 | 0
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit | 0 |
Valuation allowance | 41,451,000 | 35,150,000
Increase in valuation allowance | 6,300,000 | 5,100,000
Unrecognized tax benefits income tax penalties accrued | 0 | 0
U.S. federal jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 91,400,000 |
Operating loss carryforwards limitations on use | offset future income tax liabilities and expire at various dates through 2037 |
Deferred Tax Assets, Tax Credit Carryforwards, Research | $ 3,600,000 | 3,200,000
U.S. federal jurisdiction | Minimum [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 44,000,000 |
State jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 116,000,000 |
Operating loss carryforwards limitations on use | offset future income tax liabilities and expire at various dates through 2040 |
Deferred Tax Assets, Tax Credit Carryforwards, Research | $ 2,000,000 | $ 1,800,000

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