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Intangible Assets
 9 Months Ended
Sep. 30, 2020
Intangible Assets [Abstract]  
Intangible Assets



7.  Intangible Assets



Intangible assets consist of the following (in thousands):





 

 

 

 

 

 



 

 

 

 

 

 



 

September 30,

 

December 31,



 

2020

 

2019

Patents and copyrights

 

$

 15,184 

 

$

 16,612 

Accumulated amortization

 

 

 (12,858)

 

 

 (13,734)



 

$

 2,326 

 

$

 2,878