Income Taxes - Deferred Tax Assets Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Components of Deferred Tax Assets and Liabilities [Abstract]
Excess tax basis over book basis of property, plant, and equipment	$ 6,924	$ 7,225
Operating loss carryforwards	41,440	40,817
Capital loss carryforwards	14,954	14,394
Capital expenditures	366	366
Stock compensation	33	54
VAT recoverable	144	176
Unrealized foreign exchange gain/loss	6	7
Offering costs	104	157
Accrued vacation	24	22
Other	0	0
Total future tax assets	63,995	63,218
Valuation allowance for future tax assets	(57,995)	(63,218)
Total income tax assets	6,000	0
Deferred proceeds for tax purposes from royalty transaction	6,000	0
Other investments	0	0
Total deferred income tax liabilities	6,000	0
Total deferred taxes, net	$ 0	$ 0