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Property and equipment - Depreciation allocation (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation of property and equipment $ 188,003 $ 256,666 $ 356,288
Discontinued operations      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation of property and equipment   159,939 255,597
General and administrative expenses      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation of property and equipment $ 188,003 $ 96,727 $ 100,691