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Intangible Assets
 12 Months Ended
Dec. 31, 2013
Intangible Assets

(3)    Intangible Assets

Intangible assets as of December 31, 2013 are as follows:

 

     Gross      Accumulated
Amortization		     Net      Weighted Average
Remaining Useful
Life (years)		  

Technology rights

    $ 11,624       $ (915 )    $ 10,709         16.6   
  

 

 

     

 

 

    

 

 

     

 

 

  

Amortization expense for the years ended December 31, 2013 and 2012 was $0.6 million and $0.3 million, respectively, and is included in research and development expense. Estimated future amortization expense, based upon the Company’s intangible assets as of December 31, 2013 is as follows:

 

Year Ending December 31,

    Amount  

2014

    $ 646   

2015

      646   

2016

      646   

2017

      646   

2018

      646   

Thereafter

      7,479   
  

 

 

  

Total

    $ 10,709