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Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment [Member]
Noncontrolling Interest [Member]
Parent [Member]
Parent [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Accumulated Deficit [Member]
Accumulated Deficit [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Convertible Preferred Stock [member]
Preferred Stock [Member]
Common Stock [Member]
Beginning balance at Dec. 31, 2018 $ (339.1)     $ (339.1)   $ 98.3 $ (0.3) $ (437.1)   $ 1,182.4  
Beginning balance, shares at Dec. 31, 2018                   224,058,550 104,177,280
Net loss (388.0)     (388.0)       (388.0)      
Unrealized gain (loss) on investments 0.4     0.4     0.4        
Issuance of shares in connection with acquisitions 0.1     0.1   0.1          
Issuance of shares in connection with acquisitions, Shares                     40,990
Issuance of Series G convertible preferred stock, net of issuance costs                   $ 343.3  
Issuance of Series G convertible preferred stock, net of issuance costs, Shares                   22,306,800  
Issuance of common stock upon exercise of stock options 7.6     7.6   7.6          
Issuance of common stock upon exercise of stock options, Shares                     5,075,790
Stock-based compensation 37.4     37.4   37.4          
Ending balance at Dec. 31, 2019 (681.6)     (681.6)   143.4 0.1 (825.1)   $ 1,525.7  
Ending balance, shares at Dec. 31, 2019                   246,365,350 109,294,060
Net loss (270.2)     (270.2)       (270.2)      
Cumulative change in accounting principle (ASU 2016-13)   $ (5.6)     $ (5.6)       $ (5.6)    
Unrealized gain (loss) on investments (0.1)     (0.1)     (0.1)        
Issuance of shares in connection with acquisitions 1.2     1.2   1.2          
Issuance of shares in connection with acquisitions, Shares                     401,310
Conversion of Series D convertible preferred stock 40.0     40.0   40.0       $ (40.0)  
Conversion of Series D convertible preferred stock, Shares                   (9,382,620) 9,382,620
Issuance of Series G convertible preferred stock, net of issuance costs                   $ 1.0  
Issuance of Series G convertible preferred stock, net of issuance costs, Shares                   64,820  
Issuance of common stock upon exercise of stock options 9.6     9.6   9.6          
Issuance of common stock upon exercise of stock options, Shares                     2,710,680
Early exercise of stock options                     1,183,230
Vesting of early exercised stock options 0.6     0.6   0.6          
Stock-based compensation 43.2     43.2   43.2          
Ending balance at Dec. 31, 2020 (862.9)     (862.9)   238.0 0.0 (1,100.9)   $ 1,486.7  
Ending balance, shares at Dec. 31, 2020                   237,047,550 122,971,900
Net loss (494.1)   $ 0.0 (494.1)       (494.1)      
Acquisition related non-controlling interest 3.8   3.8                
Issuance of shares in connection with acquisitions 10.1     10.1   10.1          
Issuance of shares in connection with acquisitions, Shares                     855,740
Conversion of Series D convertible preferred stock 67.6     67.6   67.6       $ (67.6)  
Conversion of Series D convertible preferred stock, Shares                   (15,920,450) 15,920,450
Conversion of convertible preferred stock to common stock in connection with the initial public offering 1,419.1     1,419.1   1,419.1       $ (1,419.1)  
Conversion of convertible preferred stock to common stock in connection with the initial public offering, Shares                   (221,127,100) 223,033,725
Issuance of common stock in connection with the initial public offering, net of issuance costs 438.7     438.7   438.7          
Issuance of common stock in connection with the initial public offering, net of issuance costs, Shares                     26,296,438
Issuance of common stock upon exercise of stock options $ 21.3     21.3   21.3          
Issuance of common stock upon exercise of stock options, Shares 9,318,462                   9,318,012
Early exercise of stock options 918,590                    
Vesting of early exercised stock options $ 5.0     5.0   5.0          
Stock-based compensation 301.4     301.4   301.4          
Issuance of common stock upon settlement of RSUs, net of taxes withheld (62.4)     (62.4)   (62.4)          
Issuance of common stock upon settlement of RSUs, net of taxes withheld, Shares                     10,871,486
Ending balance at Dec. 31, 2021 $ 847.6   $ 3.8 $ 843.8   $ 2,438.8 $ 0.0 $ (1,595.0)   $ 0.0  
Ending balance, shares at Dec. 31, 2021                   0 409,267,751