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Intangible Assets and Goodwill
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Disclosure Intangible Assets
The following table summarizes intangible assets, net (in thousands):
December 31,
20242023
Finite-lived intangible assets:
Supplier agreements$37,525 $37,525 
Capitalized development costs— 103 
Total finite-lived intangible assets37,525 37,628 
Accumulated amortization:
Supplier agreements(34,430)(32,944)
Capitalized development costs— (103)
Total accumulated amortization(34,430)(33,047)
Total intangible assets, net$3,095 $4,581 
Amortization expense of intangible assets was $1.5 million and $1.9 million for the years ended December 31, 2024 and 2023, respectively. Estimated amortization expense for intangible assets is approximately $1.5 million, $1.5 million, and $0.1 million in fiscal year 2026, 2027, and 2028, respectively.
Impairment of Intangible Assets
During the year ended December 31, 2023, a certain vendor for the Company’s carbon credits was not able to perform under terms of the agreement, which indicated that an impairment triggering event occurred for the carbon credits held for future use, and the Company determined the carrying value of the indefinite-lived intangible asset exceeded its estimated fair value. The Company compared the indicated fair value to the carrying value of its indefinite-lived asset, and as a result of the analysis, an impairment charge of $1.7 million was recorded for the carbon credits held for future use for the year ended December 31, 2023.
During the year ended December 31, 2023, adverse changes in the business climate indicated that an impairment triggering event occurred for one supplier agreement, and the Company determined the carrying value of the finite-lived intangible asset exceeded its estimated fair value. The Company compared the indicated fair value to the carrying value of its finite-lived asset, and as a result of the analysis, an impairment charge of $1.2 million was recorded for the supplier agreement for the year ended December 31, 2023.