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Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2016
Intangible Assets [Abstract]  
Schedule of amortizable intangible assets
Intangible assets consist of the following (in thousands):

  
September 30, 2016
  
December 31, 2015
 
  
Gross
carrying
value
  
Accumulated
amortization
  
Gross
carrying
value
  
Accumulated
Amortization
 
Amortizable intangible assets Licensed technology
 
$
9,608
  
$
1,021
  
$
7,156
  
$
547
 
Amortization expense related to intangible assets
The aggregate estimated amortization expense for intangible assets remaining as of September 30, 2016 is as follows (in thousands):
 
 
2016 
  $
203
 
2017 
  
812
 
2018 
  
812
 
2019 
  
812
 
2020
  
812
 
over 5 years 
  
5,136
 
 Total    $8,587