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Income taxes - Components of Deferred Taxes (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforward | $ 38,839,281 | $ 38,773,870
Stock compensation | 2,309,828 | 3,341,338
Amortization | 118,259 |
Capitalized R&D costs | 2,362,347 |
Lease liability |  | 47,677
Gross deferred tax assets | 43,629,715 | 42,162,885
Valuation allowance | (43,629,689) | (42,115,543)
Total deferred tax assets | 26 | 47,342
Deferred tax liabilities: |  |
Fixed assets | (26) | (818)
Right of use asset |  | (46,524)
Total deferred tax liabilities | (26) | (47,342)
Net deferred tax assets (liabilities) | $ 0 | $ 0

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