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Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2020
Intangible Assets [Abstract]  
Schedule Of Intangible Assets

Intangible assets consist of the following (in thousands):





 

 

 

 

 

 



 

 

 

 

 

 



 

June 30,

 

December 31,



 

2020

 

2019

Patents and copyrights

 

$

 15,310 

 

$

 16,612 

Accumulated amortization

 

 

 (12,863)

 

 

 (13,734)



 

$

 2,447 

 

$

 2,878