| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Costs and expenses: | ||||||||||||||||
| General and administrative | ||||||||||||||||
| Research and development | ||||||||||||||||
| Loss on fair value remeasurement of contingent consideration | — | — | ||||||||||||||
| Total costs and expenses | ||||||||||||||||
| Loss from operations | ||||||||||||||||
| Other income (expense): | ||||||||||||||||
| Interest income | ||||||||||||||||
| Interest expense | — | — | ||||||||||||||
| Grant income | — | |||||||||||||||
| Other income (expense), net | ||||||||||||||||
| Total other income (expense) | ||||||||||||||||
| Net loss and comprehensive loss | ||||||||||||||||
| Net loss per share attributable to common stockholders-basic (in dollar per share) | ||||||||||||||||
| Net loss per share attributable to common stockholders-diluted (in dollar per share) |