Fair value measurements - Schedule of fair value on a recurring basis (Details) - USD ($)	Mar. 31, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 6,365,624	$ 8,705,218
Fair Value, Recurring [Member]
Current assets:
Cash and cash equivalents	6,365,624	8,705,218
Total assets measured at fair value	6,365,624	8,705,218
Fair Value, Recurring [Member] | Level 1 [Member]
Current assets:
Cash and cash equivalents	6,365,624	8,705,218
Total assets measured at fair value	6,365,624	8,705,218
Fair Value, Recurring [Member] | Level 2 [Member]
Current assets:
Cash and cash equivalents	0	0
Total assets measured at fair value	0	0
Fair Value, Recurring [Member] | Level 3 [Member]
Current assets:
Cash and cash equivalents	0	0
Total assets measured at fair value	$ 0	$ 0