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Income Taxes - Deferred Tax Assets Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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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

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