Fair value measurements - Schedule of fair value on a recurring basis (Details) - USD ($) |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Current assets: | ||
| Cash and cash equivalents | $ 15,174,128 | $ 8,705,218 |
| Fair Value, Recurring [Member] | ||
| Current assets: | ||
| Money market funds | 13,573,269 | |
| Cash and cash equivalents | 8,705,218 | |
| Total assets measured at fair value | 13,573,269 | 8,705,218 |
| Fair Value, Recurring [Member] | Level 1 [Member] | ||
| Current assets: | ||
| Money market funds | 13,573,269 | |
| Cash and cash equivalents | 8,705,218 | |
| Total assets measured at fair value | 13,573,269 | 8,705,218 |
| Fair Value, Recurring [Member] | Level 2 [Member] | ||
| Current assets: | ||
| Money market funds | 0 | |
| Cash and cash equivalents | 0 | |
| Total assets measured at fair value | 0 | 0 |
| Fair Value, Recurring [Member] | Level 3 [Member] | ||
| Current assets: | ||
| Money market funds | 0 | |
| Cash and cash equivalents | 0 | |
| Total assets measured at fair value | $ 0 | $ 0 |