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Intangible Assets
 9 Months Ended
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consist of patents, which management evaluates to determine whether they (i) support current products, (ii) support planned research and development, or (iii) prevent others from competing with Gevo's products.

The following table sets forth the Company’s identifiable intangible assets by classification (in thousands) as of:
 September 30, 2022
 Gross Carrying AmountAccumulated AmortizationIdentifiable Intangible Assets, netWeighted-Average Useful Life (Years)
Patents$4,580 $(888)$3,692 7.4
Defensive assets4,900 (597)4,303 8.4
Identifiable intangible assets$9,480 $(1,485)$7,995 7.9

December 31, 2021
Gross Carrying AmountAccumulated AmortizationIdentifiable Intangible Assets, NetWeighted-Average Useful Life (Years)
Patents$4,575 $(368)$4,207 7.3
Defensive assets4,895 (164)4,731 8.4
Identifiable intangible assets$9,470 $(532)$8,938 7.9

The Company recorded amortization expense of $0.4 million and $1.0 million for the three and nine months ended September 30, 2022, respectively, as compared with nil for each of the three and nine months ended September 30, 2021.
The following table details the estimated amortization of identifiable intangible assets as of September 30, 2022 (in thousands):

Year ending December 31,PatentsDefensive AssetsTotal
2022 (remaining)$151 $153 $304 
2023578 586 1,164 
2024580 588 1,168 
2025578 586 1,164 
2026578 586 1,164 
2027 and thereafter1,227 1,804 3,031 
Total$3,692 $4,303 $7,995