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Intangible Assets
 6 Months Ended
Jun. 30, 2022
Intangible Assets [Abstract]  
Intangible Assets 8. Intangible Assets

Intangible assets consist of the following (in thousands):

June 30,

December 31,

2022

2021

Patents and copyrights

$

14,518

$

14,755

Accumulated amortization

(12,956)

(12,970)

$

1,562

$

1,785