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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]        
Net deferred tax assets $ 500,000us-gaap_DeferredTaxAssetsNet $ 500,000us-gaap_DeferredTaxAssetsNet    
Uncertain income tax positions 0us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits    
Income tax expense or benefit $ 70,000us-gaap_IncomeTaxExpenseBenefit $ 273,000us-gaap_IncomeTaxExpenseBenefit $ 0us-gaap_IncomeTaxExpenseBenefit $ 0us-gaap_IncomeTaxExpenseBenefit