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Property and Equipment - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property Plant And Equipment [Abstract]      
Depreciation and amortization $ 1,404us-gaap_DepreciationAndAmortization $ 1,327us-gaap_DepreciationAndAmortization $ 1,207us-gaap_DepreciationAndAmortization