Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Income Tax [Line Items]
Income tax expense (benefit)	$ 61,833	$ (52,732)
Federal corporate income tax rate	27.00%
Valuation allowance	$ 12,251,000		$ 12,533,000
Federal income tax net operating loss carry forward	$ 12,700,000		$ 14,500,000
Net operating loss carry forwards expiration beginning year	2032
Net operating loss carry forwards expiration ending year	2037
State [Member]
Income Tax [Line Items]
Operating loss carryforwards	$ 0	$ 0

Income tax.

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Net operating loss carryforwards expiration beginning year.

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Net operating loss carryforwards expiration ending year.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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