Summary of Significant Accounting Policies - Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Accounting Policies [Abstract]
Raw materials	$ 594	$ 827
Spare parts	41	39
Total	$ 635	$ 866

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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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