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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, 2020   48.5      
Beginning balance at Dec. 31, 2020 $ 642.2 $ 0.0 $ (491.9) $ 1,133.5 $ 0.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 24.9     24.9  
Net loss (91.3)   (91.3)    
Restricted stock vesting (in shares)   0.1      
Restricted stock vesting 0.0        
Proceeds from exercise of stock options (in shares)   0.4      
Proceeds from exercise of stock options 8.1     8.1  
Unrealized loss on available-for-sale securities (1.0)       (1.0)
Ending balance (in shares) at Jun. 30, 2021   49.0      
Ending balance at Jun. 30, 2021 582.9 $ 0.0 (583.2) 1,166.5 (0.4)
Beginning balance (in shares) at Mar. 31, 2021   48.8      
Beginning balance at Mar. 31, 2021 615.2 $ 0.0 (532.9) 1,148.3 (0.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 14.6     14.6  
Net loss (50.3)   (50.3)    
Restricted stock vesting (in shares)   0.1      
Restricted stock vesting 0.0        
Proceeds from exercise of stock options (in shares)   0.1      
Proceeds from exercise of stock options 3.6     3.6  
Unrealized loss on available-for-sale securities (0.2)       (0.2)
Ending balance (in shares) at Jun. 30, 2021   49.0      
Ending balance at Jun. 30, 2021 $ 582.9 $ 0.0 (583.2) 1,166.5 (0.4)
Beginning balance (in shares) at Dec. 31, 2021 53.0 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 36.6     36.6  
Net loss (133.4)   (133.4)    
Proceeds from exercise of stock options (in shares)   0.2      
Proceeds from exercise of stock options 3.1 $ 0.1   3.0  
Unrealized loss on available-for-sale securities $ (17.4)       (17.4)
Ending balance (in shares) at Jun. 30, 2022 53.2 53.2      
Ending balance at Jun. 30, 2022 $ 670.6 $ 0.1 (816.3) 1,508.8 (22.0)
Beginning balance (in shares) at Mar. 31, 2022   53.1      
Beginning balance at Mar. 31, 2022 723.3 $ 0.0 (746.3) 1,488.3 (18.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 20.0     20.0  
Net loss (70.0)   (70.0)    
Proceeds from exercise of stock options (in shares)   0.1      
Proceeds from exercise of stock options 0.6 $ 0.1   0.5  
Unrealized loss on available-for-sale securities $ (3.3)       (3.3)
Ending balance (in shares) at Jun. 30, 2022 53.2 53.2      
Ending balance at Jun. 30, 2022 $ 670.6 $ 0.1 $ (816.3) $ 1,508.8 $ (22.0)