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Income Taxes (Details 1) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Income Taxes |  |
Stock-based compensation | $ 1.5 | $ 3.7
Patent impairment provision | 0.3 | 0.3
Net operating loss carry-forward | 17.0 | 15.0
Research and development expenses - capitalized for tax purposes | 1.4 | 0.5
Research and development tax credits | 0.3 | 0.3
Total deferred tax asset | 20.5 | 19.8
Less: valuation allowance | (20.5) | (19.8)
Net deferred tax asset | $ 0.0 | $ 0.0

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