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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Preferred stock
Class A and Class B common stock
Additional paid-in capital
Accumulated deficit
Accumulated other comprehensive income (loss)
Shares outstanding, beginning of the period (in shares) at Dec. 31, 2015   147.6 187.3      
Shareholders equity, beginning balance at Dec. 31, 2015 $ 185.6 $ 615.3 $ 0.0 $ 297.3 $ (727.3) $ 0.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Vesting of early exercised stock options 0.5     0.5    
Issuance of common stock, options and awards related to acquisitions (in shares)     0.1      
Issuance of common stock, options and awards related to acquisitions 0.7     0.7    
Repurchase of unvested common stock (related to early exercised stock options) (in shares)     (0.3)      
Repurchase of unvested common stock (related to early exercised stock options) (0.1)     (0.1)    
Stock-based compensation 147.6     147.6    
Other comprehensive income (loss) (1.3)         (1.3)
Net loss (210.2)       (210.2)  
Shareholders equity, ending balance at Dec. 31, 2016 $ 122.8 $ 615.3 $ 0.0 446.0 (937.5) (1.0)
Shares outstanding, end of the period (in shares) at Dec. 31, 2016   147.6 187.1      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative-effect adjustment from adoption of ASU 2016-09       0.5 (0.5)  
Release of restricted stock units (in shares)     14.6      
Shares repurchased for tax withholdings on release of restricted stock (in shares) (5.5)   (5.5)      
Shares repurchased for tax withholdings on release of restricted stock $ (87.9)     (87.9)    
Donation of common stock to charitable foundation (in shares)     0.6      
Donation of common stock to charitable foundation $ 9.4     9.4    
Exercise of stock options and awards (in shares) 0.1   0.2      
Exercise of stock options and awards $ 0.5     0.5    
Repurchase of unvested common stock (related to early exercised stock options) (in shares)     (0.2)      
Stock-based compensation 164.6     164.6    
Other comprehensive income (loss) 5.2         5.2
Net loss (111.7)       (111.7)  
Shareholders equity, ending balance at Dec. 31, 2017 $ 102.9 $ 615.3 $ 0.0 533.1 (1,049.7) 4.2
Shares outstanding, end of the period (in shares) at Dec. 31, 2017   147.6 196.8      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Release of restricted stock units (in shares)     40.4      
Shares repurchased for tax withholdings on release of restricted stock (in shares) (15.6)   (15.6)      
Shares repurchased for tax withholdings on release of restricted stock $ (351.8)     (226.9) (124.9)  
Conversion of preferred stock to common stock in connection with initial public offering (in shares)   (147.6) 147.6      
Conversion of preferred stock to common stock in connection with initial public offering   $ (615.3)   615.3    
Issuance of common stock in connection with initial public offering and private placement, net of underwriters' discounts and commissions and issuance costs (in shares)     37.0      
Issuance of common stock in connection with initial public offering and private placement, net of underwriters' discounts and commissions and issuance costs $ 739.7     739.7    
Exercise of stock options and awards (in shares) 3.4   3.4      
Exercise of stock options and awards $ 26.2     26.2    
Stock-based compensation 650.1     650.1    
Other comprehensive income (loss) (5.4)         (5.4)
Net loss (484.9)          
Shareholders equity, ending balance at Dec. 31, 2018 $ 676.8 $ 0.0 $ 0.0 $ 2,337.5 $ (1,659.5) $ (1.2)
Shares outstanding, end of the period (in shares) at Dec. 31, 2018   0.0 409.6