| 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 |
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| Operating expenses: | ||||||||||||||||
| Research and development | ||||||||||||||||
| General and administrative | ||||||||||||||||
| Operating loss | ||||||||||||||||
| Other income, net | ||||||||||||||||
| Loss before income tax expense | ||||||||||||||||
| Income tax expense | ||||||||||||||||
| Net loss | ||||||||||||||||
| Basic and diluted net loss per share (in dollars per share) |