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Other Balance Sheet Accounts - Summary of Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Total of property and equipment $ 25,563us-gaap_PropertyPlantAndEquipmentGross $ 26,075us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization (22,924)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (22,140)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 2,639us-gaap_PropertyPlantAndEquipmentNet 3,935us-gaap_PropertyPlantAndEquipmentNet
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total of property and equipment 17,515us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
18,027us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total of property and equipment $ 8,048us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
$ 8,048us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember