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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Accumulated Deficit
Cumulative-effect adjustment to equity due to adoption of ASU 2016-02
Beginning Balance (in shares) at Dec. 31, 2018   90.8        
Beginning Balance at Dec. 31, 2018 $ 480.8 $ 0.1 $ 1,660.4 $ (2.0) $ (1,177.7) $ 8.0
Net income (loss) (50.8)       (50.8)  
Unrealized gain on debt securities available-for-sale, net of tax 2.6     2.6    
Share-based compensation expense 33.7   33.7      
Issuance of common stock for vested restricted stock units (in shares)   0.4        
Issuance of common stock for stock option exercises (in shares)   0.3        
Issuance of common stock for stock options 6.9   6.9      
Issuance of common stock for employee stock purchase plan 2.5   2.5      
Ending Balance (in shares) at Jun. 30, 2019   91.5        
Ending Balance at Jun. 30, 2019 483.7 $ 0.1 1,703.5 0.6 (1,220.5)  
Beginning Balance (in shares) at Mar. 31, 2019   91.3        
Beginning Balance at Mar. 31, 2019 409.3 $ 0.1 1,681.3 (0.3) (1,271.8)  
Net income (loss) 51.3       51.3  
Unrealized gain on debt securities available-for-sale, net of tax 0.9     0.9    
Share-based compensation expense 17.9   17.9      
Issuance of common stock for stock option exercises (in shares)   0.2        
Issuance of common stock for stock options 4.3   4.3      
Ending Balance (in shares) at Jun. 30, 2019   91.5        
Ending Balance at Jun. 30, 2019 483.7 $ 0.1 1,703.5 0.6 (1,220.5)  
Beginning Balance (in shares) at Dec. 31, 2019   92.3        
Beginning Balance at Dec. 31, 2019 636.9 $ 0.1 1,768.1 1.4 (1,132.7)  
Net income (loss) 117.0       117.0  
Unrealized gain on debt securities available-for-sale, net of tax 3.2     3.2    
Share-based compensation expense 52.3   52.3      
Issuance of common stock for vested restricted stock units (in shares)   0.5        
Issuance of common stock for stock option exercises (in shares)   0.4        
Issuance of common stock for stock options 19.1   19.1      
Issuance of common stock for employee stock purchase plan 2.7   2.7      
Ending Balance (in shares) at Jun. 30, 2020   93.2        
Ending Balance at Jun. 30, 2020 831.2 $ 0.1 1,842.2 4.6 (1,015.7)  
Beginning Balance (in shares) at Mar. 31, 2020   92.8        
Beginning Balance at Mar. 31, 2020 700.3 $ 0.1 1,796.9 (1.4) (1,095.3)  
Net income (loss) 79.6       79.6  
Unrealized gain on debt securities available-for-sale, net of tax 6.0     6.0    
Share-based compensation expense 29.5   29.5      
Issuance of common stock for vested restricted stock units (in shares)   0.1        
Issuance of common stock for stock option exercises (in shares)   0.3        
Issuance of common stock for stock options 15.8   15.8      
Ending Balance (in shares) at Jun. 30, 2020   93.2        
Ending Balance at Jun. 30, 2020 $ 831.2 $ 0.1 $ 1,842.2 $ 4.6 $ (1,015.7)