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INTANGIBLE ASSETS
 9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS INTANGIBLE ASSETS
The Company’s intangible assets were as follows:
September 30, 2024December 31, 2023
(in thousands)
Intangible assets with indefinite lives:
Emissions allowances
$302 $316 
Intangible assets with definite lives:
Patent and intellectual property license8,963 8,963 
Less: Accumulated amortization (1,295)(398)
Patent and intellectual property license, net
7,668 8,565 
Intangible assets, net
$7,970 $8,881 
Amortization expense related to amortizing intangible assets was $0.3 million and $0.9 million for the three and nine months ended September 30, 2024, respectively, as compared to $0.1 million for both the three and nine months ended September 30, 2023. No impairment charges were recorded during the three and nine months ended September 30, 2024 and 2023.