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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Components Of Deferred Income Tax Assets And Liabilities [Line Items]      
Net deferred income tax asset $ 17,784,000us-gaap_DeferredTaxAssetsLiabilitiesNet $ 16,451,000us-gaap_DeferredTaxAssetsLiabilitiesNet  
Federal net operating loss carryforwards 34,700,000us-gaap_OperatingLossCarryforwards 17,400,000us-gaap_OperatingLossCarryforwards  
Interest and penalties related to income taxes 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
Accrued interest and penalties related to income taxes $ 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued $ 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued $ 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Income tax examination period Years before 2011.    
Minimum [Member]      
Components Of Deferred Income Tax Assets And Liabilities [Line Items]      
Federal net operating loss carryforwards expiration period Dec. 31, 2029 Dec. 31, 2029  
Maximum [Member]      
Components Of Deferred Income Tax Assets And Liabilities [Line Items]      
Federal net operating loss carryforwards expiration period Dec. 31, 2033 Dec. 31, 2032