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Goodwill and Intangible Assets, net
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]    
Goodwill and Intangible Assets, net

9. Goodwill and Intangible Assets, net

The changes in the carrying amount of goodwill for the nine months ended September 30, 2013 are as follows:

 

Balance as of December 31, 2012

   $   

Acquisitions

     13,846   
  

 

 

 

Balance as of September 30, 2013

   $ 13,846   

 

 

No goodwill or accumulated impairment losses existed as of December 31, 2012. There are no accumulated impairment losses as of September 30, 2013.

Intangible assets consist of the following at September 30, 2013:

 

     

Gross Carrying

Amount

    

Accumulated

Amortization

    Net  

 

 

Patents and related technologies

   $ 34,342       $ (6,979   $ 27,363   

In-process research and development

     14,900                14,900   
  

 

 

 

Total

   $ 49,242       $ (6,979   $ 42,263   

 

 

 

Intangible assets consist of the following at December 31, 2012:

 

     

Gross Carrying

Amount

    

Accumulated

Amortization

    Net  

 

 

Patents and related technologies

   $ 34,342       $ (4,851   $ 29,491   

Favorable rent asset

     646         (631     15   
  

 

 

 

Total

   $ 34,988       $ (5,482   $ 29,506   

 

 

Amortization expense was $709 and $756 for the three months ended September 30, 2013 and 2012, respectively, and $2,143 and $2,270 for the nine months ended September 30, 2013 and 2012, respectively. At September 30, 2013, the weighted average useful life for patents and related technology was 12.4 years.

8. Intangible Assets, net

Intangible assets consist of the following at December 31, 2012:

 

      Gross Carrying
Amount
     Accumulated
Amortization
    Net  

 

 

Patents and related technologies

   $ 34,342       $ (4,851   $ 29,491   

Favorable rent asset

     646         (631     15   
  

 

 

 

Total

   $ 34,988       $ (5,482   $ 29,506   

 

 

 

Intangible assets consist of the following at December 31, 2011:

 

      Gross Carrying
Amount
     Accumulated
Amortization
    Net  

 

 

Patents and related technologies

   $ 34,342       $ (2,014   $ 32,328   

Favorable rent asset

     646         (441     205   
  

 

 

 

Total

   $ 34,988       $ (2,455   $ 32,533   

 

 

Amortization expense was $3,027 and $1,260 for the years ended December 31, 2012 and 2011, respectively. At December 31, 2012, the weighted average useful life for patents and related technology was 12.4 years and the useful life for the favorable rent asset was 3.4 years. Total amortization expense is estimated to be $2,853 for 2013, $2,641 for each year from 2014 through 2017, and $16,098 for the cumulative period thereafter.