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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Federal statutory rate	21.00%
Net operating losses, state	$ 25,200,000
Net operating losses expiration date	2040
Net operating losses, federal	$ 24,100,000
Accrued income taxes current	3,481,710	$ 4,483,800
Domestic Tax Authority [Member]
Income taxes paid		$ 5,100,000	$ 5,100,000
Accrued income taxes current	3,100,000
State and Local Jurisdiction [Member]
Accrued income taxes current	$ 300,000

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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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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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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