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Related Party Transactions - Summary of Rent and Related Operating Expenses Recognized under Various Agreements (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2026 | Sep. 30, 2025 | Mar. 31, 2025
Related Party Transaction [Line Items] |  |  |
Research and development | $ 14,379 |  | $ 15,377
General and administrative | 5,327 |  | 5,041
Lease Agreement |  |  |
Related Party Transaction [Line Items] |  |  |
Research and development | 72 |  | 217
General and administrative | 25 |  | 74
Total expenses | 97 |  | $ 291
Marlinspike Group, LLC | Consulting Agreements |  |  |
Related Party Transaction [Line Items] |  |  |
General and administrative | 60 | $ 60 |
Total expenses | $ 60 | $ 60 |

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