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Income Taxes - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net deferred tax assets	$ 47,700,000	$ 43,200,000
Valuation allowance	$ 47,700,000	$ 43,200,000
Federal statutory tax rate	21.00%
Adjustments to provisional amounts recorded	$ 0
One-time transition tax, adjustments to provisional amounts recorded	0
Tax act, executive compensation, cap on deductibility, amount	$ 1,000,000
Tax act, interest expense limitation, minimum percentage of adjusted taxable income	30.00%
Estimate of interest expense limitation before consideration of valuation allowance	$ 7,500,000
Net impact in income loss	$ 0

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Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act for which accounting for tax effect is incomplete.

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Amount of reasonable estimate for income tax expense from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act for which accounting for tax effect is incomplete.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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

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