Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets

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Intangible Assets
 6 Months Ended
Jun. 30, 2011
Intangible Assets  
Intangible Assets
(2)           Intangible Assets

Intangible assets consist of the following (in thousands):

   
June 30, 2011
    
December 31, 2010
  
   
Gross
carrying
value
    
Accumulated
amortization
    
Gross
carrying
value
    
Accumulated
Amortization
  
Amortizable intangible assets
 
Patents
   $  2,624     $  2,156     $  2,624     $  2,050  

Amortization expense related to intangible assets totaled $53,000 and $106,000 for each of the three and six months ended June 30, 2011 and totaled $53,000 and $106,000 for each of the three and six months ended June 30, 2010. The aggregate estimated amortization expense for intangible assets remaining as of June 30, 2011 is as follows (in thousands):
 
 
 2011   $ 106  
 2012     82  
 2013     44  
 2014     44  
 2015     44  
 over 5 years     148  
         
 Total   $ 468