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Collaboration Agreements - Sanofi (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 93 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Dec. 31, 2025
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Total collaboration revenue | $ 3,604,000 | $ 0 | $ 3,604,000 | $ 0 |  |
Sanofi | Collaborative Arrangement |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Remaining performance obligation | 0 |  | 0 |  | $ 0 |
Contract liability | 0 |  | 0 |  | 0 | $ 0
Sanofi | Collaborative Arrangement | Peripheral Program License |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Milestone payments upon achievement of certain clinical, regulatory and sales milestone events | $ 495,000,000.0 |  | $ 495,000,000.0 |  | 495,000,000.0 |
Sanofi | Collaborative Arrangement | Milestone Triggered |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Total collaboration revenue |  |  |  |  | 100,000,000.0 |
Sanofi | Collaborative Arrangement | Product |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Total collaboration revenue |  |  |  |  | $ 0 |

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