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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