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Intangible Assets
 3 Months Ended
Mar. 31, 2017
Intangible Assets [Abstract]  
Intangible Assets

5.   Intangible Assets

Intangible assets consisted of the following (in thousands):







 

 

 

 

 

 



 

 

 

 

 

 



 

March 31,

 

December 31,



 

2017

 

2016

Acquired patents and licenses

 

$

 7,985 

 

$

 7,985 

Less: Accumulated amortization

 

 

 (1,608)

 

 

 (1,442)



 

$

 6,377 

 

$

 6,543