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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment, Net, by Type [Abstract]    
Property and equipment, gross $ 11,731us-gaap_PropertyPlantAndEquipmentGross $ 10,786us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization (9,692)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (8,961)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 2,039us-gaap_PropertyPlantAndEquipmentNet 1,825us-gaap_PropertyPlantAndEquipmentNet
Depreciation expense 761us-gaap_DepreciationDepletionAndAmortization 780us-gaap_DepreciationDepletionAndAmortization
Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Property and equipment, useful life 2 years  
Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Property and equipment, useful life 10 years  
Office furniture and equipment    
Property, Plant and Equipment, Net, by Type [Abstract]    
Property and equipment, gross 7,234us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
6,676us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Office furniture and equipment | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Property and equipment, useful life 3 years  
Office furniture and equipment | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Property and equipment, useful life 10 years  
Leasehold improvements    
Property, Plant and Equipment, Net, by Type [Abstract]    
Property and equipment, gross 1,474us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
1,429us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Leasehold improvements | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Property and equipment, useful life 1 year  
Leasehold improvements | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Property and equipment, useful life 6 years  
Manufacturing and test equipment    
Property, Plant and Equipment, Net, by Type [Abstract]    
Property and equipment, gross $ 3,023us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
$ 2,681us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
Manufacturing and test equipment | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Property and equipment, useful life 2 years  
Manufacturing and test equipment | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Property and equipment, useful life 10 years