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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 (Loss) Income
Beginning balance (in shares) at Dec. 31, 2021   53.0      
Beginning balance at Dec. 31, 2021 $ 781.7 $ 0.0 $ (682.9) $ 1,469.2 $ (4.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 16.6     16.6  
Net loss (63.4)   (63.4)    
Exercise/ vesting of stock-based compensation (in shares)   0.1      
Exercise/ vesting of stock-based compensation 2.5     2.5  
Unrealized gain (loss) on available-for-sale securities (14.1)       (14.1)
Ending balance (in shares) at Mar. 31, 2022   53.1      
Ending balance at Mar. 31, 2022 $ 723.3 $ 0.0 (746.3) 1,488.3 (18.7)
Beginning balance (in shares) at Dec. 31, 2022 53.2 53.2      
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 19.9     19.9  
Net loss (81.9)   (81.9)    
Exercise/ vesting of stock-based compensation (in shares)   0.2      
Exercise/ vesting of stock-based compensation 1.5     1.5  
Unrealized gain (loss) on available-for-sale securities $ 6.6       6.6
Ending balance (in shares) at Mar. 31, 2023 53.4 53.4      
Ending balance at Mar. 31, 2023 $ 511.0 $ 0.1 $ (1,047.3) $ 1,570.8 $ (12.6)