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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Net deferred tax assets $ 45,300,000 $ 43,200,000
Valuation allowance $ 45,300,000 $ 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 $ 2,000,000  
Net impact in income loss $ 0