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Income Taxes - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)
Income Taxes [Line Items]
Net deferred tax asset	$ 0	$ 0
Income tax expense	0
Valuation allowance, net operating loss	800,000	$ 800,000
Estimated Annual Effective Tax Rate		15.216%
Effective tax rate		0.00%
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	185,000,000	$ 185,000,000
Net operating loss carryforwards expiration year		2025
Net operating loss carryforwards expiration year		2038
Net operating loss carryforwards	5,200,000	$ 5,200,000
Foreign [Member]
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	53,200,000	53,200,000
Net operating loss carryforwards	$ 4,300,000	$ 4,300,000

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Income taxes.

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates.

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