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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