Fair value gain (loss) on embedded derivatives - Schedule of Embedded Derivatives (Details) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Embedded derivatives [Abstract] | ||||
| Fair value gain (loss) on embedded derivatives | $ 322,000 | $ (2,895,000) | $ 1,871,000 | $ 11,250,000 |
| Fair value change in embedded derivative | $ 322,000 | $ (2,895,000) | $ 1,871,000 | $ 11,250,000 |