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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-In Capital
Additional Paid-In Capital
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance (in shares) at Dec. 31, 2020     93.5          
Beginning Balance at Dec. 31, 2020 $ 1,126.2   $ 0.1 $ 1,849.7   $ 1.8 $ (725.4)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 96.9           96.9  
Unrealized loss on debt securities available-for-sale, net of tax (1.4)         (1.4)    
Stock-based compensation expense 98.6     98.6        
Issuances of common stock under stock plans (in shares)     1.3          
Issuances of common stock under stock plans 25.7     25.7        
Ending Balance (in shares) at Sep. 30, 2021     94.8          
Ending Balance at Sep. 30, 2021 1,346.0   $ 0.1 1,974.0   0.4 (628.5)  
Beginning Balance (in shares) at Jun. 30, 2021     94.6          
Beginning Balance at Jun. 30, 2021 1,279.2   $ 0.1 1,929.4   0.7 (651.0)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 22.5           22.5  
Unrealized loss on debt securities available-for-sale, net of tax (0.3)         (0.3)    
Stock-based compensation expense 37.1     37.1        
Issuances of common stock under stock plans (in shares)     0.2          
Issuances of common stock under stock plans 7.5     7.5        
Ending Balance (in shares) at Sep. 30, 2021     94.8          
Ending Balance at Sep. 30, 2021 1,346.0   $ 0.1 1,974.0   0.4 (628.5)  
Beginning Balance (in shares) at Dec. 31, 2021     94.9          
Beginning Balance at Dec. 31, 2021 1,374.0 $ (32.3) $ 0.1 2,011.4 $ (106.8) (1.7) (635.8) $ 74.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 65.5           65.5  
Unrealized loss on debt securities available-for-sale, net of tax (12.3)         (12.3)    
Stock-based compensation expense 129.6     129.6        
Issuances of common stock under stock plans (in shares)     1.2          
Issuances of common stock under stock plans 20.1     20.1        
Ending Balance (in shares) at Sep. 30, 2022     96.1          
Ending Balance at Sep. 30, 2022 1,544.6   $ 0.1 2,054.3   (14.0) (495.8)  
Beginning Balance (in shares) at Jun. 30, 2022     95.6          
Beginning Balance at Jun. 30, 2022 1,423.4   $ 0.1 1,999.8   (12.2) (564.3)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 68.5           68.5  
Unrealized loss on debt securities available-for-sale, net of tax (1.8)         (1.8)    
Stock-based compensation expense 43.1     43.1        
Issuances of common stock under stock plans (in shares)     0.5          
Issuances of common stock under stock plans 11.4     11.4        
Ending Balance (in shares) at Sep. 30, 2022     96.1          
Ending Balance at Sep. 30, 2022 $ 1,544.6   $ 0.1 $ 2,054.3   $ (14.0) $ (495.8)