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Income Taxes - Additional Information (Detail) - USD ($) | 6 Months Ended |
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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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- Definition 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. + References No definition available. + Details
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