Inventories - Components of Inventory Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Inventory [Line Items]
Raw materials	$ 104	$ 168
Spare parts	471	354
Total inventories	3,809	6,347
SAF, isooctane and isooctene
Inventory [Line Items]
Finished goods	1,167	1,581
Jet fuel
Inventory [Line Items]
Work in process	0	51
Environmental Attributes
Inventory [Line Items]
Work in process	$ 2,067	$ 4,193

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date for elements of machinery or equipment held for the purpose of replacing similar parts in the course of repair or maintenance.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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