Income taxes - Components of Income Taxes (Details) - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Income taxes
Net loss	$ (12,599,569)	$ (12,958,711)
Foreign
Income taxes
Net loss	(256,019)	(218,261)
United States
Income taxes
Net loss	$ (12,343,550)	$ (12,740,450)

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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