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Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2016
Intangible Assets [Abstract]  
Schedule of amortizable intangible assets

Intangible assets consist of the following (in thousands):

 

  March 31, 2016  December 31, 2015 
  Gross
carrying
value		  Accumulated
amortization		  Gross
carrying
value		  Accumulated
Amortization		 
Amortizable intangible assets                 
Licensed technology $7,156  $692  $7,156  $547 

 
Amortization expense related to intangible assets
The aggregate estimated amortization expense for intangible assets remaining as of March 31, 2016 is as follows (in thousands):

 

2016 $436 
2017  582 
2018  582 
2019  582 
2020  582 
over 5 years   3,700 
     
Total  $6,464