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Income Taxes (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Taxes |  |
Capitalized start-up costs | $ 100,000 | $ 400,000
Stock-based compensation | 3,300,000 | 3,000,000
Patent impairment provision | 300,000 | 0
Accrued legal settlement | 1,100,000 | 0
Partnership basis differences | 0 | (300,000)
Net operating loss carry-forward | 24,300,000 | 22,300,000
Research and development tax credits | 300,000 | 300,000
Less: valuation allowance | (29,400,000) | (25,700,000)
Total | $ 0 | $ 0

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