| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Operating expenses | ||||||||||||||||
| Research and development | ||||||||||||||||
| General and administrative | ||||||||||||||||
| Total operating expenses | ||||||||||||||||
| Operating loss | ||||||||||||||||
| Other (expense) income: | ||||||||||||||||
| Interest expense - royalty agreement | ||||||||||||||||
| Fair value adjustments on derivative liabilities - royalty agreement | ||||||||||||||||
| Fair value adjustments on derivative liabilities - contingent value right liability | — | — | ||||||||||||||
| Interest income, net | ||||||||||||||||
| Other (expense) income, net | ||||||||||||||||
| Loss before income taxes | ||||||||||||||||
| Income tax benefit (expense) | ||||||||||||||||
| Net loss | ||||||||||||||||
| Net loss per share of Common Stock - basic (in dollars per share) | ||||||||||||||||
| Net loss per share of Common Stock - diluted (in dollars per share) |