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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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