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Intangible Assets (Tables)
6 Months Ended
Jun. 30, 2015
Intangible Assets [Abstract]  
Schedule of amortizable intangible assets
Intangible assets consist of the following (in thousands):

  
June 30, 2015
  
December 31, 2014
 
  
Gross
carrying
value
  
Accumulated
amortization
  
Gross
carrying
value
  
Accumulated
Amortization
 
Amortizable intangible assets Licensed technology
 
$
7,156
  
$
256
  
$
5,000
  
$
9
 
                 
Amortization expense related to intangible assets
The aggregate estimated amortization expense for intangible assets remaining as of June 30, 2015 is as follows (in thousands):
2015
 
$
291
 
2016
  
582
 
2017
  
582
 
2018
  
582
 
2019
  
582
 
over 5 years
  
4,281
 
     
Total
 
$
6,900