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Licensing Agreements (Details) - Related Party - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 11, 2024 | May 14, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Paragon Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Campaign timeline, minimum term (in years) |  |  |  |  | 5 years |  |
Royalty step-down (as percent) |  |  | 33.00% |  | 33.00% |  |
Royalty term expiration period (in years) |  |  |  |  | 12 years |  |
Termination notice period (in days) |  |  |  |  | 60 days |  |
Sublicensing fee |  |  | $ 1,000,000 | $ 300,000 | $ 1,000,000 | $ 400,000 |
Milestone expense recognized |  |  | 6,000,000.0 | 0 | 8,500,000 | 5,500,000 |
Cash milestone payments |  |  | 3,000,000 | 2,500,000 | 5,500,000 | 5,500,000 |
Milestone payments, outstanding and payable |  |  | 3,000,000 |  | 3,000,000 |  | $ 0
Payment for sublicensing fee |  |  | $ 0 | $ 0 | 500,000 | $ 100,000 |
SPY002 License Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
First milestone payment |  | $ 3,000,000.0 |  |  |  |  |
SPY003 License Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
First milestone payment | $ 3,000,000.0 |  |  |  |  |  |
License Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Sublicensing fee, outstanding and payable |  |  |  |  | 1,000,000.0 |  | $ 500,000
Maximum | SPY001 License Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Contingent obligation based on milestones |  | 22,000,000.0 |  |  |  |  |
Maximum | SPY002 License Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Contingent obligation based on milestones |  | $ 22,000,000.0 |  |  |  |  |
Sublicensing fee |  |  |  |  | $ 20,000,000 |  |
Maximum | SPY003 License Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Contingent obligation based on milestones | $ 22,000,000.0 |  |  |  |  |  |

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