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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
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 37.4       37.4
Unrealized loss on debt securities available-for-sale, net of tax (2.8)     (2.8)  
Share-based compensation expense 22.8   22.8    
Issuances of common stock under stock plans (in shares)   0.5      
Issuances of common stock under stock plans 6.0   6.0    
Ending Balance (in shares) at Mar. 31, 2020   92.8      
Ending Balance at Mar. 31, 2020 700.3 $ 0.1 1,796.9 (1.4) (1,095.3)
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)
Net income 32.1       32.1
Unrealized loss on debt securities available-for-sale, net of tax (0.8)     (0.8)  
Share-based compensation expense 32.9   32.9    
Issuances of common stock under stock plans (in shares)   1.0      
Issuances of common stock under stock plans 15.2   15.2    
Ending Balance (in shares) at Mar. 31, 2021   94.5      
Ending Balance at Mar. 31, 2021 $ 1,205.6 $ 0.1 $ 1,897.8 $ 1.0 $ (693.3)