Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Additional Information (Detail)

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Intangible Assets - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]      
Amortization expenses of intangible assets $ 323us-gaap_AmortizationOfIntangibleAssets $ 360us-gaap_AmortizationOfIntangibleAssets $ 1,422us-gaap_AmortizationOfIntangibleAssets