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Intangible Assets
9 Months Ended
Sep. 30, 2012
Intangible Assets [Abstract]  
Intangible Assets
(2)           Intangible Assets

Intangible assets consist of the following (in thousands):

   
September 30, 2012
  
December 31, 2011
 
   
Gross
carrying
value
  
Accumulated
amortization
  
Gross
carrying
value
  
Accumulated
Amortization
 
Amortizable intangible assets Patents
 $ 2,624  $ 2,333  $ 2,624  $ 2,262 
                  

Amortization expense related to intangible assets totaled $11,000 and $71,000 for each of the three and nine months ended September 30, 2012 and totaled $53,000 and $159,000 for each of the three and nine months ended September 30, 2011. The aggregate estimated amortization expense for intangible assets remaining as of September 30, 2012 is as follows (in thousands):
 
2012
 $11 
2013
  44 
2014
  44 
2015
  44 
2016
  44 
over 5 years
  104 
      
Total
 $291