| 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 | ||||||||||||||||
| Gain on sale of ENTADFI® assets | ||||||||||||||||
| Operating loss from continuing operations | ||||||||||||||||
| Non-operating income (expenses): | ||||||||||||||||
| Gain on extinguishment of debt | ||||||||||||||||
| Change in fair value of equity securities | ||||||||||||||||
| Other income, net | ||||||||||||||||
| Total non-operating income | ||||||||||||||||
| Net loss from continuing operations | ||||||||||||||||
| Net loss | ||||||||||||||||
| Net loss per basic and diluted common shares and pre-funded warrants outstanding (in dollars per share) |