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Property and Equipment (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Land $ 695,000 $ 695,000  
Building and improvements 7,902,000 7,800,000  
Engineering and test equipment 11,631,000 11,604,000  
Computer Equipment And Software Gross 25,368,000 28,143,000  
Furniture and fixtures 1,166,000 1,578,000  
Leasehold improvements 6,477,000 4,655,000  
Property and equipment, gross 53,239,000 54,475,000  
Less: accumulated depreciation (43,704,000) (46,651,000)  
Property and equipment, net 9,535,000 7,824,000  
Depreciation 3,600,000 3,600,000 4,200,000
Capitalized Computer Software, Amortization 1,000,000 1,000,000 1,200,000
Capitalized Computer Software, Accumulated Amortization 12,700,000 15,700,000  
Capitalized Computer Software, Net $ 2,500,000 $ 1,700,000