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Intangible Assets - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Mar. 31, 2026
Intangible Asset, Finite-Lived [Line Items] |  |  |  |  |
Intangible assets, finite-lived, net | $ 35,250 |  | $ 35,250 |  |
Intangible asset amortization | 750 | $ 0 | 750 | $ 0 |
Intangible asset accumulated amortization | 700 |  | 700 |  |
Collaborative Arrangement With F-Star And Acquisition Of F-Star Gamma |  |  |  |  |
Intangible Asset, Finite-Lived [Line Items] |  |  |  |  |
Intangible assets, finite-lived, net |  |  |  |  | $ 36,000
Asset acquisition, milestone payment | 28,800 |  |  |  |
Asset acquisition, contingent consideration, liability, current | $ 7,200 |  | 7,200 |  |
Contingent payments upon achievement of milestones |  |  | 174,000 |  |
Collaborative Arrangement With F-Star And Acquisition Of F-Star Gamma | Regulatory |  |  |  |  |
Intangible Asset, Finite-Lived [Line Items] |  |  |  |  |
Contingent payments upon achievement of milestones |  |  | 24,000 |  |
Collaborative Arrangement With F-Star And Acquisition Of F-Star Gamma | Commercial |  |  |  |  |
Intangible Asset, Finite-Lived [Line Items] |  |  |  |  |
Contingent payments upon achievement of milestones |  |  | $ 150,000 |  |

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