| Line Item | Jun 30, 2026 | Mar 31, 2026 | Dec 31, 2025 | Sep 30, 2025 | Jun 30, 2025 | Mar 31, 2025 | Dec 31, 2024 | Sep 30, 2024 | Jun 30, 2024 | Mar 31, 2024 | Dec 31, 2023 | Sep 30, 2023 | Jun 30, 2023 | Mar 31, 2023 | Dec 31, 2022 | Sep 30, 2022 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Research and development | ||||||||||||||||
| General and administrative | ||||||||||||||||
| Total operating expenses | — | — | ||||||||||||||
| Loss from operations | ||||||||||||||||
| Other (loss) income: | ||||||||||||||||
| Interest income | ||||||||||||||||
| Interest expense | ||||||||||||||||
| Other (loss) income | ||||||||||||||||
| Foreign exchange (loss) gain | ||||||||||||||||
| Total other (loss) income | ||||||||||||||||
| Loss before income taxes | ||||||||||||||||
| Income tax expense | ||||||||||||||||
| Net loss | ||||||||||||||||
| Net loss per share—basic and diluted (in dollars per share) |