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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
Treasury Stock
Beginning Balance (in shares) at Dec. 31, 2017   87.0        
Beginning Balance at Dec. 31, 2017 $ 419.4 $ 0.1 $ 1,093.7 $ (2.6) $ (671.8) $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (in shares)   1.0        
Issuance of common stock under equity incentive plans 0.1   0.1      
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.1        
Issuance of common stock for Employee Stock Purchase Plan 4.1   4.1      
Share-based compensation expense 24.6   24.6      
Net loss (24.2)       (24.2)  
Net loss (2.3)     (2.3)    
Ending Balance (in shares) at Mar. 31, 2018   88.1        
Ending Balance at Mar. 31, 2018 421.7 $ 0.1 1,122.5 (4.9) (696.0) 0.0
Beginning Balance (in shares) at Dec. 31, 2018   90.0        
Beginning Balance at Dec. 31, 2018 663.3 $ 0.1 1,560.6 1.5 (798.9) (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (in shares)   0.9        
Issuance of common stock under equity incentive plans 0.2   0.2      
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.1        
Issuance of common stock for Employee Stock Purchase Plan 4.8   4.8      
Share-based compensation expense 25.0   25.0      
Cumulative-effect adjustment from adoption of new lease accounting standard (Note 2) 2.1          
Cumulative-effect adjustment from adoption of new lease accounting standard (Note 2) | Accounting Standards Update 2016-02         2.1  
Net loss (26.9)       (26.9)  
Net loss 0.1     0.1    
Ending Balance (in shares) at Mar. 31, 2019   91.0        
Ending Balance at Mar. 31, 2019 $ 668.6 $ 0.1 $ 1,590.6 $ 1.6 $ (823.7) $ (100.0)