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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