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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
May 10, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Subsequent Event [Line Items]        
Common stock, par value per share (in usd per share)     $ 0.01 $ 0.01
Sanofi Pasteur Inc. APA | Private Placement | Subsequent Events        
Subsequent Event [Line Items]        
Sale of stock, number of shares issued in transaction (in shares) 6,880,481      
Common stock, par value per share (in usd per share) $ 0.01      
Share, price per share (in usd per share) $ 10.00      
Proceeds from equity method investment $ 68.8      
Sanofi Pasteur Inc. APA | Forecast        
Subsequent Event [Line Items]        
Collaboration agreement upfront payment amount   $ 500.0    
Sanofi Pasteur Inc. APA | Forecast | Licensed COVID-19 Products and Royalty Payments        
Subsequent Event [Line Items]        
Development, tech transfer, launch, and sales milestone payments   700.0    
Sanofi Pasteur Inc. APA | Forecast | First Four Adjuvant Products        
Subsequent Event [Line Items]        
Development, tech transfer, launch, and sales milestone payments   200.0    
Sanofi Pasteur Inc. APA | Forecast | Adjuvant Products Thereafter        
Subsequent Event [Line Items]        
Development, tech transfer, launch, and sales milestone payments   $ 210.0