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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Common
Accumulated Deficit
Additional Paid-in Capital
Accumulated Other Comprehensive Loss (Income)
Treasury
Beginning balance (in shares) at Dec. 31, 2022   53,200,000        
Beginning balance at Dec. 31, 2022 $ 564.9 $ 0.1 $ (965.4) $ 1,549.4 $ (19.2)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 71.6     71.6    
Net loss (367.3)   (367.3)      
Issuance of common stock under equity incentive plans (in shares)   400,000        
Issuance of common stock under equity incentive plans 4.5     4.5    
Common stock issued, net of issuance costs (in shares)   14,400,000        
Common stock issued, net of issuance costs 370.2     370.2    
Unrealized gain on available-for-sale securities 16.1       16.1  
Ending balance (in shares) at Dec. 31, 2023   68,000,000.0        
Ending balance at Dec. 31, 2023 660.0 $ 0.1 (1,332.7) 1,995.7 (3.1)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 88.2     88.2    
Net loss (198.9)   (198.9)      
Issuance of common stock under equity incentive plans (in shares)   800,000        
Issuance of common stock under equity incentive plans 8.3     8.3    
Unrealized gain on available-for-sale securities $ 4.1       4.1  
Ending balance (in shares) at Dec. 31, 2024 68,800,000 68,800,000        
Ending balance (in shares) at Dec. 31, 2024 0         0
Ending balance at Dec. 31, 2024 $ 561.7 $ 0.1 (1,531.6) 2,092.2 1.0 $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 44.0     44.0    
Net loss (80.8)   (80.8)      
Issuance of common stock under equity incentive plans (in shares)   1,300,000        
Issuance of common stock under equity incentive plans $ 0.7     0.7    
Issuance of common stock for pre-funded warrants (in shares) 3,422,186 3,400,000        
Share repurchases (Treasury Stock) (in shares) 10,009,758         10,000,000.0
Share repurchases (Treasury stock) $ (91.9)         $ (91.9)
Unrealized gain on available-for-sale securities $ 0.2       0.2  
Ending balance (in shares) at Dec. 31, 2025 63,500,000 73,500,000        
Ending balance (in shares) at Dec. 31, 2025 10,000,000.0         10,000,000.0
Ending balance at Dec. 31, 2025 $ 433.9 $ 0.1 $ (1,612.4) $ 2,136.9 $ 1.2 $ (91.9)