Share-based compensation - Options - Fair Value (Details) - USD ($)	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Employee Stock Option
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value of options awarded	$ 573,163	$ 313,423

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details