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Intangible Assets, Net
 9 Months Ended
Sep. 30, 2017
Intangible Assets, Net [Abstract]  
Intangible Assets, Net

5.   Intangible Assets, Net

Intangible assets, net consisted of the following (in thousands):







 

 

 

 

 

 



 

 

 

 

 

 



 

September 30,

 

December 31,



 

2017

 

2016

Acquired patents and licenses

 

$

 7,985 

 

$

 7,985 

Less: Accumulated amortization

 

 

 (1,941)

 

 

 (1,442)



 

$

 6,044 

 

$

 6,543