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Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets
Intangible assets consisted of the following:
(in thousands)March 31, 2022December 31, 2021
Patents$437 $432 
Less accumulated amortization(231)(217)
$206 $215