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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment, Net, by Type [Abstract]    
Property and equipment, gross $ 11,731 $ 10,786
Accumulated depreciation and amortization (9,692) (8,961)
Property and equipment, net 2,039 1,825
Depreciation expense $ 761 780
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 $ 7,234 6,676
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 $ 1,474 1,429
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 $ 3,023 $ 2,681
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