Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Tax Credit Carryforward [Line Items]
Current Federal, State and Local, Tax Expense (Benefit)	$ 0	$ 0
Federal tax provision (benefit) rate	21.00%	21.00%
Deferred tax assets, valuation allowance	$ 3,012,513	$ 2,208,843
Tax benefits attributable to tax credit caryforwards	75,000
Tax benefits attributable to NOL	$ 2,500,000
Minimum
Tax Credit Carryforward [Line Items]
Open Tax Year	2017
Federal Tax Authority
Tax Credit Carryforward [Line Items]
TaxCreditCarryforwardBeforeValuationAllowance	$ 0
NOLCarryforwardBeforeValuationAllowance	7,300,000
NOLAndTaxCreditCarryforwardsEliminated	$ 143,300,000
TaxCreditCarryforwardsExpirationBeginningYear	2020
Tax credit carryforwards	$ 1,800,000
Net operating loss carryforwards	$ 143,700,000
Operating Loss Carryforwards, Expiration Date	2020
Federal Tax Authority | Indefinite [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	$ 5,300,000
Federal Tax Authority | Expiration Begins 2021 [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	138,400,000
State Tax Authority
Tax Credit Carryforward [Line Items]
TaxCreditCarryforwardBeforeValuationAllowance	$ 0
TaxCreditCarryforwardsExpirationBeginningYear	2020
Tax credit carryforwards	$ 1,100,000
Net operating loss carryforwards	$ 53,100,000
Operating Loss Carryforwards, Expiration Date	2020
State Tax Authority | Portion of Current [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards, Expiration Date	2025