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Property and Equipment - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Abstract]      
Write/down and disposal of property and equipment, net $ (17,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment $ 27,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment $ (200,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Depreciation and amortization expense relative to property and equipment 4,000,000us-gaap_Depreciation 4,800,000us-gaap_Depreciation 6,300,000us-gaap_Depreciation
Cost of products sold and services provided $ 2,800,000us-gaap_CostOfGoodsSoldDepreciation $ 3,700,000us-gaap_CostOfGoodsSoldDepreciation $ 4,700,000us-gaap_CostOfGoodsSoldDepreciation