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Inventories
 9 Months Ended
Sep. 30, 2022
Inventory Disclosure [Abstract]  
Inventories Inventories
The following table sets forth the components of the Company’s inventory balances (in thousands) as of:
 September 30, 2022December 31, 2021
Raw materials:  
Corn$— $301 
Enzymes and other inputs31 186 
Catalyst materials203 265 
Finished goods:
SAF, Isooctane, Isooctene and other221 335 
Isobutanol124 223 
Ethanol— 96 
Work in process:
Isobutanol— 83 
Jet fuel51 — 
Spare parts1,432 1,262 
RNG - environmental attributes2,073 — 
Total inventories$4,135 $2,751 

Environmental attributes represent distinguishable and material output from our RNG operations. The Company started allocating the joint cost of production to the sales value of RNG, credits from California's LCFS program and U.S. Environmental Protection Agency ("EPA") RIN credits. The value of the environmental attributes is reviewed for potential write-downs based on the net realizable value methodology.

During the three and nine months ended September 30, 2022, the Company adjusted its finished goods and work in process inventory to net realizable value and recorded a nil and $0.8 million loss, respectively, in cost of goods sold, as compared to $1.2 million and $2.0 million during the three and nine months ended September 30, 2021, respectively.