Inventories - Components of Inventory Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Inventory [Line Items]
Spare parts	$ 357	$ 354
Total inventories	4,355	6,347
Consumables
Inventory [Line Items]
Raw materials	29	29
Catalyst
Inventory [Line Items]
Raw materials	77	139
SAF, Isooctane, Isooctene and other
Inventory [Line Items]
Finished goods	1,061	1,457
Isobutanol
Inventory [Line Items]
Finished goods	124	124
Environmental attributes
Inventory [Line Items]
Work in process	2,656	4,193
Inventory, allowance	2,122	2,378
Jet fuel
Inventory [Line Items]
Work in process	$ 51	$ 51

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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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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Amount of valuation reserve for inventory.

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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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