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CONSOLIDATED STATEMENTS OF MEZZANINE EQUITY AND STOCKHOLDERS' DEFICIT - USD ($)
$ in Thousands
Total
Redeemable convertible preferred stock
Series F
Series G
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)
Shares issued in connection with employee stock plans (in shares)         4,472,624      
Shares issued in connection with employee stock plans 2,291         2,291    
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
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            
Increase (decrease) in mezzanine equity                
Issuance of Series F convertible preferred stock, net of issuance costs (in shares)     48,000,000 43,116,119        
Issuance of Series F convertible preferred stock, net of issuance costs     $ 599,284 $ 668,044        
Balance at end of period, Redeemable convertible preferred stock (in shares) at Dec. 31, 2020 412,742,897 412,742,897 48,000,000 43,116,119        
Balance at end of period, Redeemable convertible preferred stock at Dec. 31, 2020 $ 2,179,739 $ 2,179,739 $ 599,284 $ 668,044        
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
Shares issued in connection with employee stock plans (in shares)         4,310,197      
Shares issued in connection with employee stock plans 9,415         9,415    
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
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 48,000,000 43,116,119        
Balance at beginning of period, Redeemable convertible preferred stock at Dec. 31, 2020 $ 2,179,739 $ 2,179,739 $ 599,284 $ 668,044        
Balance at end of period, Redeemable convertible preferred stock (in shares) at Jun. 30, 2021 412,742,897 412,742,897 48,000,000 43,116,119        
Balance at end of period, Redeemable convertible preferred stock at Jun. 30, 2021 $ 2,179,739 $ 2,179,739 $ 599,284 $ 668,044        
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)
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 48,000,000 43,116,119        
Balance at end of period, Redeemable convertible preferred stock at Jun. 30, 2021 $ 2,179,739 $ 2,179,739 $ 599,284 $ 668,044        
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)
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)