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Condensed Consolidated Statements of Changes in Stockholders' Equity (unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Common
Accumulated Deficit
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2023   68.0      
Beginning 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 40.2     40.2  
Net (loss) income (104.6)   (104.6)    
Issuance of common stock under equity incentive plans (in shares)   0.6      
Issuance of common stock under equity incentive plans 5.3     5.3  
Issuance of common stock for pre-funded warrants (in shares) (0.7)       (0.7)
Ending balance (in shares) at Jun. 30, 2024   68.6      
Ending balance at Jun. 30, 2024 600.2 $ 0.1 (1,437.3) 2,041.2 (3.8)
Beginning balance (in shares) at Mar. 31, 2024   68.3      
Beginning balance at Mar. 31, 2024 609.7 $ 0.1 (1,402.1) 2,016.1 (4.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 21.6     21.6  
Net (loss) income (35.2)   (35.2)    
Issuance of common stock under equity incentive plans (in shares)   0.3      
Issuance of common stock under equity incentive plans 3.5     3.5  
Issuance of common stock for pre-funded warrants (in shares) 0.6       0.6
Ending balance (in shares) at Jun. 30, 2024   68.6      
Ending balance at Jun. 30, 2024 $ 600.2 $ 0.1 (1,437.3) 2,041.2 (3.8)
Beginning balance (in shares) at Dec. 31, 2024 68.8 68.8      
Beginning balance at Dec. 31, 2024 $ 561.7 $ 0.1 (1,531.6) 2,092.2 1.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 25.4     25.4  
Net (loss) income 21.7   21.7    
Issuance of common stock under equity incentive plans (in shares)   1.0      
Issuance of common stock under equity incentive plans 0.5     0.5  
Stock Issued During Period, Shares, Warrants Exercised   3.4      
Issuance of common stock for pre-funded warrants (in shares) $ 0.0        
Ending balance (in shares) at Jun. 30, 2025 73.2 73.2      
Ending balance at Jun. 30, 2025 $ 609.3 $ 0.1 (1,509.9) 2,118.1 1.0
Beginning balance (in shares) at Mar. 31, 2025   73.0      
Beginning balance at Mar. 31, 2025 660.1 $ 0.1 (1,448.7) 2,107.2 1.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 10.4     10.4  
Net (loss) income (61.2)   (61.2)    
Issuance of common stock under equity incentive plans (in shares)   0.2      
Issuance of common stock under equity incentive plans 0.5     0.5  
Issuance of common stock for pre-funded warrants (in shares) $ (0.5)       (0.5)
Ending balance (in shares) at Jun. 30, 2025 73.2 73.2      
Ending balance at Jun. 30, 2025 $ 609.3 $ 0.1 $ (1,509.9) $ 2,118.1 $ 1.0