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Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Income Taxes (Tables) |  |
Patent impairment provision | $ 0.3 | $ 0.3
Accrued legal settlement | 0.0 | 1.1
Net operating loss carry-forward | 27.6 | 24.3
Research and development tax credits | 0.3 | 0.3
Less: valuation allowance | (31.3) | (29.4)
Total | 0.0 | 0.0
Capitalized start-up costs | 0.0 | 0.1
Stock-based compensation | $ 3.1 | $ 3.3

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