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Income Taxes - Additional Information (Detail)	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)
Income Taxes [Line Items]
Net deferred tax asset	$ 0	$ 0
Income tax expense	0
Valuation allowance, net operating loss	2,400,000	$ 2,400,000
Estimated annual effective tax rate		27.39%
Effective tax rate		0.00%
U.S. federal tax rate		21.00%
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	1,100,000	$ 1,100,000
Net operating loss carryforwards subject to expiration	162,600,000	$ 162,600,000
Net operating loss carryforwards expiration year		2025
Net operating loss carryforwards expiration year		2037
Foreign [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	3,700,000	$ 3,700,000
Net operating loss carryforwards subject to expiration	$ 35,400,000	$ 35,400,000

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

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