Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets

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Intangible Assets
 3 Months Ended
Mar. 31, 2012
Intangible Assets [Abstract]  
Intangible Assets
(2)           Intangible Assets

Intangible assets consist of the following (in thousands):
 
   
March 31, 2012
    
December 31, 2011
  
   
Gross
carrying
value
    
Accumulated
amortization
    
Gross
carrying
value
    
Accumulated
Amortization
  
Amortizable intangible assets
 
        Patents
   $  2,624     $  2,311     $  2,624     $  2,262  
 
 
Amortization expense related to intangible assets totaled $49,000 for the three months ended March 31, 2012 and totaled $53,000 for the three ended March 31, 2011. The aggregate estimated amortization expense for intangible assets remaining as of March 31, 2012 is as follows (in thousands):
 
 2012   $ 33  
 2013     44  
 2014     44  
 2015     44  
 2016     44  
 over 5 years     104  
         
 Total   $ 313