| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Revenue: | ||||||||||||||||
| Total revenue | — | — | — | |||||||||||||
| Cost of revenue: | ||||||||||||||||
| Total cost of revenue | — | — | — | |||||||||||||
| Operating expenses: | ||||||||||||||||
| Research and development | ||||||||||||||||
| Selling, general and administrative | — | — | ||||||||||||||
| Total operating expenses | ||||||||||||||||
| % of revenue | 8388.4% | — | — | — | ||||||||||||
| Other income (expense): | ||||||||||||||||
| Interest income | ||||||||||||||||
| Other expense | ||||||||||||||||
| Total other income | ||||||||||||||||
| Net loss | ||||||||||||||||
| % of revenue | -7615.3% | — | — | — | ||||||||||||
| Net loss per share attributable to common stockholders, basic (in dollars per share) | ||||||||||||||||
| Net loss per share attributable to common stockholders, diluted (in dollars per share) |