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Intangible Assets
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets

5. Intangible Assets

Intangible assets as of June 30, 2018 and December 31, 2017 are comprised of the following (in thousands):

 

     June 30, 2018  
     Gross
amount		      Accumulated
amortization		      Net
amount		  

Technology

    $ 19,288      $ (19,288 )     $ —  

Customer relationships

      27,702        (27,702 )       —    

Intellectual property assets

      11,180        (7,214 )       3,966  
  

 

 

     

 

 

     

 

 

  

Intangible assets, net

    $ 58,170      $ (54,204 )     $ 3,966  
  

 

 

     

 

 

     

 

 

  

 

     December 31, 2017  
     Gross
amount		      Accumulated
amortization		      Net
amount		  

Technology

    $ 20,194      $ (20,194 )     $ —  

Customer relationships

      29,002        (29,002 )       —    

Intellectual property assets

      11,319        (7,258 )       4,061  
  

 

 

     

 

 

     

 

 

  

Intangible assets, net

    $ 60,515      $ (56,454 )     $ 4,061  
  

 

 

     

 

 

     

 

 

  

Aggregate amortization expenses for intangible assets totaled $408 thousand and $298 thousand for the six months ended June 30, 2018 and 2017, respectively.