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Consolidated Statements of Stockholders' Equity - USD ($)
Total
Convertible preferred stock
Class A and Class B common stock
Additional paid-in capital
Accumulated deficit
Accumulated other comprehensive income (loss)
Shares outstanding, beginning balance (in shares) at Dec. 31, 2016   147,600,000 187,100,000      
Shareholders equity, beginning balance at Dec. 31, 2016 $ 122,800,000 $ 615,300,000 $ 0 $ 446,000,000.0 $ (937,500,000) $ (1,000,000.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Release of restricted stock units (in shares)     14,600,000      
RSUs repurchased for tax withholdings on release of restricted stock (in shares)     (5,500,000)      
RSUs repurchased for tax withholdings on release of restricted stock (87,900,000)     (87,900,000)    
Donation of common stock to charitable foundation (in shares)     600,000      
Donation of common stock to charitable foundation 9,400,000     9,400,000    
Exercise of stock options and awards (in shares)     200,000      
Exercise of stock options and awards 500,000     500,000    
Repurchase of unvested common stock (related to early exercised stock options) (in shares)     (200,000)      
Repurchase of unvested common stock (related to early exercised stock options) 0          
Stock-based compensation 164,600,000     164,600,000    
Other comprehensive income (loss) 5,200,000         5,200,000
Net loss (111,700,000)       (111,700,000)  
Shares outstanding, ending balance (in shares) at Dec. 31, 2017   147,600,000 196,800,000      
Shareholders equity, ending balance at Dec. 31, 2017 $ 102,900,000 $ 615,300,000 $ 0 533,100,000 (1,049,700,000) 4,200,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Release of restricted stock units (in shares)     40,400,000      
RSUs repurchased for tax withholdings on release of restricted stock (in shares) (15,600,000)   15,600,000      
RSUs repurchased for tax withholdings on release of restricted stock $ (351,800,000)     226,900,000 124,900,000  
Exercise of stock options and awards (in shares) 3,400,000   3,400,000      
Exercise of stock options and awards $ 26,200,000     26,200,000    
Conversion of preferred stock to common stock in connection with initial public offering (in shares)   147,600,000 (147,600,000)      
Conversion of preferred stock to common stock in connection with initial public offering 0 $ (615,300,000)   615,300,000    
Issuance of common stock in connection with initial public offering and private placement, net of underwriters' discounts and commissions and issuance costs (in shares)     37,000,000.0      
Issuance of common stock in connection with initial public offering and private placement, net of underwriters' discounts and commissions and issuance costs 739,700,000     739,700,000    
Stock-based compensation 650,100,000     650,100,000    
Other comprehensive income (loss) (5,400,000)         (5,400,000)
Net loss (484,900,000)       (484,900,000)  
Shares outstanding, ending balance (in shares) at Dec. 31, 2018   0 409,600,000      
Shareholders equity, ending balance at Dec. 31, 2018 $ 676,800,000 $ 0 $ 0 2,337,500,000 (1,659,500,000) (1,200,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Release of restricted stock units (in shares)     11,200,000      
RSUs repurchased for tax withholdings on release of restricted stock (in shares) (4,100,000)   (4,100,000)      
RSUs repurchased for tax withholdings on release of restricted stock $ (85,400,000)     (70,400,000) (15,000,000.0)  
Exercise of stock options and awards (in shares) 300,000   300,000      
Exercise of stock options and awards $ 2,200,000     2,200,000    
Assumed stock options in connection with acquisition 800,000     800,000    
Stock-based compensation 261,200,000     261,200,000    
Other comprehensive income (loss) 4,500,000         4,500,000
Net loss (52,700,000)       (52,700,000)  
Shares outstanding, ending balance (in shares) at Dec. 31, 2019   0 417,000,000.0      
Shareholders equity, ending balance at Dec. 31, 2019 $ 808,400,000 $ 0 $ 0 $ 2,531,300,000 $ (1,726,200,000) $ 3,300,000