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Purchased Patents (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Purchased Patents      
Weighted-Average Life 10 years 10 years  
Gross Carrying Amount $ 2,292,000 $ 2,292,000  
Accumulated Amortization 1,609,000 1,380,000  
Amortization expense 229,000 229,000 229,000
Estimated annual aggregate amortization expense through December 31, 2015 229,000    
Net book value of intangible assets $ 683,000 $ 912,000