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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment, Net, by Type [Abstract]    
Property and equipment, gross $ 10,786 $ 13,638
Accumulated depreciation and amortization (8,961) (11,930)
Property and equipment, net 1,825 1,708
Depreciation expense 874 1,238
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 6,676 9,552
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 1,429 1,413
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 $ 2,681 $ 2,673
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