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Intangible Assets - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Amortization expense $ 21,000us-gaap_AmortizationOfIntangibleAssets
Expected amortization expense for the year ended December 31, 2015 $ 83,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear