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Income taxes - Components of Deferred Taxes (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Net operating loss carryforward $ 41,058,034 $ 41,784,757
Stock compensation 4,051,018 3,955,371
Amortization 39,412 56,882
Capitalized R&D costs 4,850,529 3,487,955
Fixed assets 981 3,574
Accrued expenses 165,558 155,320
Gross deferred tax assets 50,165,532 49,443,859
Valuation allowance $ (50,165,532) $ (49,443,859)