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Income Taxes (Details 1) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Income Taxes |  |
Stock-based compensation | $ 3,700,000 | $ 3,500,000
Patent impairment provision | 300,000 | 400,000
Net operating loss carry-forward | 15,000,000.0 | 13,600,000
Research and development expenses - capitalized for tax purposes | 500,000 | 100,000
Research and development tax credits | 300,000 | 300,000
Total deferred tax asset | 19,800,000 | 17,900,000
Less: valuation allowance | (19,800,000) | (17,900,000)
Net deferred tax asset | $ 0 | $ 0

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