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Balance Sheet Detail (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Inventories:    
Work-in-process $ 537,000 $ 542,000
Finished goods 91,000 25,000
Total 628,000 567,000
Intangible assets    
Gross Carrying Amount 10,020,000 10,020,000
Accumulated Amortization 8,865,000 8,365,000
Net Carrying Value 1,155,000 1,655,000
Estimated aggregate amortization expense to be recognized in future    
Remainder of 2014 500,000  
2015 300,000  
2016 100,000  
2017 100,000  
2018 100,000  
Developed technology
    
Intangible assets    
Gross Carrying Amount 9,240,000 9,240,000
Accumulated Amortization 8,586,000 8,142,000
Net Carrying Value 654,000 1,098,000
Developed technology | Minimum
    
Intangible assets    
Life 3 years 3 years
Developed technology | Maximum
    
Intangible assets    
Life 5 years 5 years
Patent license
    
Intangible assets    
Life 7 years 7 years
Gross Carrying Amount 780,000 780,000
Accumulated Amortization 279,000 223,000
Net Carrying Value $ 501,000 $ 557,000