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Financial Statement Details - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 71,644 $ 73,728  
Less—accumulated depreciation and amortization (62,832) (68,449)  
Depreciation and amortization expense (5,000) $ (6,300) $ (7,900)
Assets Held under Capital Leases      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 1,500    
Less—accumulated depreciation and amortization $ (200)