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Intangible Assets
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consisted of the following:
(in thousands)December 31, 2022December 31, 2021
Patents$404 $432 
Less accumulated amortization(244)(217)
Total intangible assets$160 $215 
The weighted average useful life of the patents was 4.41 years. For the year ended December 31, 2022, 2021 and 2020, amortization expense was $0.0 million.