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Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Finite-Lived Intangible Assets [Line Items]    
Intangible asset, net $ 36,000 $ 0
Collaborative Arrangement With F-Star And Acquisition Of F-Star Gamma    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset, net 36,000  
Contingent payments upon achievement of milestones 174,000  
Collaborative Arrangement With F-Star And Acquisition Of F-Star Gamma | Regulatory    
Finite-Lived Intangible Assets [Line Items]    
Contingent payments upon achievement of milestones 24,000  
Collaborative Arrangement With F-Star And Acquisition Of F-Star Gamma | Commercial    
Finite-Lived Intangible Assets [Line Items]    
Contingent payments upon achievement of milestones $ 150,000