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Intangible Assets
 6 Months Ended
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consisted of the following:
(in thousands)June 30, 2022December 31, 2021
Patents$425 $432 
Less accumulated amortization(235)(217)
$190 $215 
The weighted average useful life of the intangible assets was 4.9 years. For the three and six months ended June 30, 2022 and 2021, amortization expense was $0.0 million.