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CONDENSED CONSOLIDATED STATEMENTS OF MEZZANINE EQUITY AND STOCKHOLDERS' DEFICIT - USD ($)
$ in Thousands
Total
Redeemable convertible preferred stock
Common stock
Additional paid-in capital
Accumulated other comprehensive income
Accumulated deficit
Balance at beginning of period, Redeemable convertible preferred stock (in shares) at Dec. 31, 2018   291,739,421        
Balance at beginning of period, Redeemable convertible preferred stock at Dec. 31, 2018   $ 539,678        
Increase (decrease) in mezzanine equity            
Issuance of Series F convertible preferred stock, net of issuance costs (in shares)   29,887,357        
Issuance of Series F convertible preferred stock, net of issuance costs   $ 372,733        
Balance at end of period, Redeemable convertible preferred stock (in shares) at Dec. 31, 2019 321,626,778 321,626,778        
Balance at end of period, Redeemable convertible preferred stock at Dec. 31, 2019 $ 912,411 $ 912,411        
Balance at beginning of period, Common stock (in shares) at Dec. 31, 2018     220,339,931      
Balance at beginning of period at Dec. 31, 2018 (21,482)   $ 1 $ 68,615 $ 10 $ (90,108)
Increase (decrease) in stockholder's equity            
Net income (loss) (106,569)         (106,569)
Vesting of early-exercised stock options 1,205     1,205    
Repurchase of common stock (in shares)     (10,010)      
Change in other comprehensive income 179       179  
Share-based compensation $ 27,328     27,328    
Balance at end of period, Common stock (in shares) at Dec. 31, 2019 224,802,545   224,802,545      
Balance at end of period at Dec. 31, 2019 $ (97,048)   $ 1 99,439 189 (196,677)
Increase (decrease) in mezzanine equity            
Issuance of Series F convertible preferred stock, net of issuance costs (in shares)   44,640,000        
Issuance of Series F convertible preferred stock, net of issuance costs   $ 557,297        
Balance at end of period, Redeemable convertible preferred stock (in shares) at Jun. 30, 2020   366,266,778        
Balance at end of period, Redeemable convertible preferred stock at Jun. 30, 2020   $ 1,469,708        
Increase (decrease) in stockholder's equity            
Net income (loss) 5,082         5,082
Shares issued in connection with employee stock plans (in shares)     1,017,823      
Shares issued in connection with employee stock plans 1,440     1,440    
Vesting of early-exercised stock options 312     312    
Repurchase of common stock (in shares)     (70,000)      
Repurchase of common stock (875)         (875)
Change in other comprehensive income (174)       (174)  
Share-based compensation 4,314     4,314    
Balance at end of period, Common stock (in shares) at Jun. 30, 2020     225,750,368      
Balance at end of period at Jun. 30, 2020 $ (86,949)   $ 1 105,505 15 (192,470)
Balance at beginning of period, Redeemable convertible preferred stock (in shares) at Dec. 31, 2019 321,626,778 321,626,778        
Balance at beginning of period, Redeemable convertible preferred stock at Dec. 31, 2019 $ 912,411 $ 912,411        
Balance at end of period, Redeemable convertible preferred stock (in shares) at Dec. 31, 2020 412,742,897 412,742,897        
Balance at end of period, Redeemable convertible preferred stock at Dec. 31, 2020 $ 2,179,739 $ 2,179,739        
Balance at beginning of period, Common stock (in shares) at Dec. 31, 2019 224,802,545   224,802,545      
Balance at beginning of period at Dec. 31, 2019 $ (97,048)   $ 1 99,439 189 (196,677)
Increase (decrease) in stockholder's equity            
Net income (loss) 7,449         7,449
Vesting of early-exercised stock options 527     527    
Repurchase of common stock (in shares)     (81,196)      
Repurchase of common stock (875)         (875)
Change in other comprehensive income 284       284  
Share-based compensation $ 24,926     24,926    
Balance at end of period, Common stock (in shares) at Dec. 31, 2020 229,031,546   229,031,546      
Balance at end of period at Dec. 31, 2020 $ (55,322)   $ 1 134,307 473 (190,103)
Balance at beginning of period, Redeemable convertible preferred stock (in shares) at Mar. 31, 2020   321,626,778        
Balance at beginning of period, Redeemable convertible preferred stock at Mar. 31, 2020   $ 912,411        
Increase (decrease) in mezzanine equity            
Issuance of Series F convertible preferred stock, net of issuance costs (in shares)   44,640,000        
Issuance of Series F convertible preferred stock, net of issuance costs   $ 557,297        
Balance at end of period, Redeemable convertible preferred stock (in shares) at Jun. 30, 2020   366,266,778        
Balance at end of period, Redeemable convertible preferred stock at Jun. 30, 2020   $ 1,469,708        
Balance at beginning of period, Common stock (in shares) at Mar. 31, 2020     225,567,600      
Balance at beginning of period at Mar. 31, 2020 (146,791)   $ 1 103,205 57 (250,054)
Increase (decrease) in stockholder's equity            
Net income (loss) 57,584         57,584
Shares issued in connection with employee stock plans (in shares)     182,768      
Shares issued in connection with employee stock plans 515     515    
Vesting of early-exercised stock options 154     154    
Change in other comprehensive income (42)       (42)  
Share-based compensation 1,631     1,631    
Balance at end of period, Common stock (in shares) at Jun. 30, 2020     225,750,368      
Balance at end of period at Jun. 30, 2020 $ (86,949)   $ 1 105,505 15 (192,470)
Balance at beginning of period, Redeemable convertible preferred stock (in shares) at Dec. 31, 2020 412,742,897 412,742,897        
Balance at beginning of period, Redeemable convertible preferred stock at Dec. 31, 2020 $ 2,179,739 $ 2,179,739        
Balance at end of period, Redeemable convertible preferred stock (in shares) at Jun. 30, 2021 412,742,897 412,742,897        
Balance at end of period, Redeemable convertible preferred stock at Jun. 30, 2021 $ 2,179,739 $ 2,179,739        
Balance at beginning of period, Common stock (in shares) at Dec. 31, 2020 229,031,546   229,031,546      
Balance at beginning of period at Dec. 31, 2020 $ (55,322)   $ 1 134,307 473 (190,103)
Increase (decrease) in stockholder's equity            
Net income (loss) (1,946,468)         (1,946,468)
Shares issued in connection with employee stock plans (in shares)     3,581,521      
Shares issued in connection with employee stock plans 6,579     6,579    
Vesting of early-exercised stock options 173     173    
Repurchase of common stock (in shares)     (3,110)      
Change in other comprehensive income 52       52  
Share-based compensation $ 10,222     10,222    
Balance at end of period, Common stock (in shares) at Jun. 30, 2021 232,609,957   232,609,957      
Balance at end of period at Jun. 30, 2021 $ (1,984,764)   $ 1 151,281 525 (2,136,571)
Balance at beginning of period, Redeemable convertible preferred stock (in shares) at Mar. 31, 2021   412,742,897        
Balance at beginning of period, Redeemable convertible preferred stock at Mar. 31, 2021   $ 2,179,739        
Balance at end of period, Redeemable convertible preferred stock (in shares) at Jun. 30, 2021 412,742,897 412,742,897        
Balance at end of period, Redeemable convertible preferred stock at Jun. 30, 2021 $ 2,179,739 $ 2,179,739        
Balance at beginning of period, Common stock (in shares) at Mar. 31, 2021     232,257,374      
Balance at beginning of period at Mar. 31, 2021 (1,485,186)   $ 1 149,217 502 (1,634,906)
Increase (decrease) in stockholder's equity            
Net income (loss) (501,665)         (501,665)
Shares issued in connection with employee stock plans (in shares)     355,693      
Shares issued in connection with employee stock plans 782     782    
Vesting of early-exercised stock options 113     113    
Repurchase of common stock (in shares)     (3,110)      
Change in other comprehensive income 23       23  
Share-based compensation $ 1,169     1,169    
Balance at end of period, Common stock (in shares) at Jun. 30, 2021 232,609,957   232,609,957      
Balance at end of period at Jun. 30, 2021 $ (1,984,764)   $ 1 $ 151,281 $ 525 $ (2,136,571)