Share-based compensation - General Information (Details)				12 Months Ended
	Jul. 31, 2025	Jul. 28, 2025	Oct. 07, 2021 shares	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Compensation cost recognized | $				$ 333,183	$ 401,216
Stockholders' Equity Note, Stock Split, Conversion Ratio	0.2	0.2
Share Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value of options awarded | $				$ 572,745	$ 573,163
Equity Plan 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares reserved (in shares) | shares			300,000
Threshold percentage (as a percent)			4.50%
Threshold number of shares (in shares) | shares			120,000