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CONDENSED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ DEFICIT (Unaudited) - USD ($)
$ in Thousands
Total
Series A Redeemable Convertible Preferred Stock
Series B Redeemable Convertible Preferred Stock
Series C Redeemable Convertible Preferred Stock
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2019   8,350,743 46,176,715 0      
Beginning balance at Dec. 31, 2019   $ 7,519 $ 66,186 $ 0      
Increase (Decrease) in Temporary Equity [Roll Forward]              
Exercise of redeemable convertible preferred stock warrants (in shares)       27,308,227      
Exercise of redeemable convertible preferred stock warrants       $ 96,963      
Conversion of redeemable convertible preferred stock (in shares)       1,690,380      
Conversion of redeemable convertible preferred stock       $ 6,182      
Ending balance (in shares) at Sep. 30, 2020   8,350,743 46,176,715 28,998,607      
Ending balance at Sep. 30, 2020   $ 7,519 $ 66,186 $ 103,145      
Beginning balance (in shares) at Dec. 31, 2019         18,704,118    
Beginning balance at Dec. 31, 2019 $ (58,139)       $ 0 $ 4,945 $ (63,084)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Exercise of common stock options (in shares)         1,918,499    
Vesting of early exercised stock options 729         729  
Stock-based compensation 242         242  
Vesting of restricted stock and issuance of common stock per restricted stock purchase agreements (in shares)         7,373,163    
Net income (loss) (27,816)           (27,816)
Ending balance (in shares) at Sep. 30, 2020         27,995,780    
Ending balance at Sep. 30, 2020 (84,984)       $ 0 5,916 (90,900)
Beginning balance (in shares) at Dec. 31, 2019   8,350,743 46,176,715 0      
Beginning balance at Dec. 31, 2019   $ 7,519 $ 66,186 $ 0      
Ending balance (in shares) at Dec. 31, 2020   8,350,743 46,176,715 28,998,607      
Ending balance at Dec. 31, 2020 176,323 $ 7,519 $ 66,186 $ 102,618      
Beginning balance (in shares) at Dec. 31, 2019         18,704,118    
Beginning balance at Dec. 31, 2019 (58,139)       $ 0 4,945 (63,084)
Ending balance (in shares) at Dec. 31, 2020         27,995,780    
Ending balance at Dec. 31, 2020 (101,400)       $ 0 9,036 (110,436)
Beginning balance (in shares) at Jun. 30, 2020   8,350,743 46,176,715 28,998,607      
Beginning balance at Jun. 30, 2020   $ 7,519 $ 66,186 $ 103,145      
Ending balance (in shares) at Sep. 30, 2020   8,350,743 46,176,715 28,998,607      
Ending balance at Sep. 30, 2020   $ 7,519 $ 66,186 $ 103,145      
Beginning balance (in shares) at Jun. 30, 2020         20,224,118    
Beginning balance at Jun. 30, 2020 (76,591)       $ 0 5,771 (82,362)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Exercise of common stock options (in shares)         398,499    
Stock-based compensation 145         145  
Vesting of restricted stock and issuance of common stock per restricted stock purchase agreements (in shares)         7,373,163    
Net income (loss) (8,538)           (8,538)
Ending balance (in shares) at Sep. 30, 2020         27,995,780    
Ending balance at Sep. 30, 2020 (84,984)       $ 0 5,916 (90,900)
Beginning balance (in shares) at Dec. 31, 2020   8,350,743 46,176,715 28,998,607      
Beginning balance at Dec. 31, 2020 176,323 $ 7,519 $ 66,186 $ 102,618      
Increase (Decrease) in Temporary Equity [Roll Forward]              
Exercise of redeemable convertible preferred stock warrants (in shares)   48,513 31,369        
Exercise of redeemable convertible preferred stock warrants   $ 831 $ 537        
Conversion of redeemable convertible preferred stock (in shares)   (8,399,256) (46,208,084) (28,998,607)      
Conversion of redeemable convertible preferred stock   $ (8,350) $ (66,723) $ (102,618)      
Ending balance (in shares) at Sep. 30, 2021   0 0 0      
Ending balance at Sep. 30, 2021 0 $ 0 $ 0 $ 0      
Beginning balance (in shares) at Dec. 31, 2020         27,995,780    
Beginning balance at Dec. 31, 2020 (101,400)       $ 0 9,036 (110,436)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Conversion of redeemable convertible preferred stock (in shares)         83,605,947    
Conversion of redeemable convertible preferred stock 177,691       $ 1 177,690  
Conversion of convertible notes into common stock (in shares)         18,611,914    
Conversion of convertible notes into common stock $ 297,792         297,792  
Exercise of common stock options (in shares) 1,698,265       1,485,282    
Exercise of common stock options $ 417         417  
Stock-based compensation expense from issuance of a fully vested warrant to vendor 1,239         1,239  
Issuance of common stock at public offering, net of issuance costs (in shares)         14,375,000    
Issuance of common stock at public offering, net of issuance costs 205,293         205,293  
Exercise of common stock warrants (in shares)         84,118    
Exercise of common stock warrants 77         77  
Vesting of early exercised stock options 109         109  
Tax withholding on exercise of stock options and restricted stock units (4,586)         (4,586)  
Common stock issued to outgoing directors (in shares)         128,000    
Stock-based compensation 25,558         25,558  
Vesting of restricted stock and issuance of common stock per restricted stock purchase agreements (in shares)         76,557    
Net income (loss) 52,188           52,188
Ending balance (in shares) at Sep. 30, 2021         146,362,598    
Ending balance at Sep. 30, 2021 654,378       $ 1 712,625 (58,248)
Beginning balance (in shares) at Jun. 30, 2021   8,350,743 46,176,715 28,998,607      
Beginning balance at Jun. 30, 2021   $ 7,519 $ 66,186 $ 102,618      
Increase (Decrease) in Temporary Equity [Roll Forward]              
Exercise of redeemable convertible preferred stock warrants (in shares)   48,513 31,369        
Exercise of redeemable convertible preferred stock warrants   $ 831 $ 537        
Conversion of redeemable convertible preferred stock (in shares)   (8,399,256) (46,208,084) (28,998,607)      
Conversion of redeemable convertible preferred stock   $ (8,350) $ (66,723) $ (102,618)      
Ending balance (in shares) at Sep. 30, 2021   0 0 0      
Ending balance at Sep. 30, 2021 0 $ 0 $ 0 $ 0      
Beginning balance (in shares) at Jun. 30, 2021         29,128,604    
Beginning balance at Jun. 30, 2021 (61,332)       $ 0 16,264 (77,596)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Conversion of redeemable convertible preferred stock (in shares)         83,605,947    
Conversion of redeemable convertible preferred stock 177,691       $ 1 177,690  
Conversion of convertible notes into common stock (in shares)         18,611,914    
Conversion of convertible notes into common stock 297,792         297,792  
Exercise of common stock options (in shares)         436,576    
Exercise of common stock options 159         159  
Issuance of common stock at public offering, net of issuance costs (in shares)         14,375,000    
Issuance of common stock at public offering, net of issuance costs 205,293         205,293  
Vesting of early exercised stock options 46         46  
Tax withholding on exercise of stock options and restricted stock units (4,586)         (4,586)  
Common stock issued to outgoing directors (in shares)         128,000    
Stock-based compensation 19,967         19,967  
Vesting of restricted stock and issuance of common stock per restricted stock purchase agreements (in shares)         76,557    
Net income (loss) 19,348           19,348
Ending balance (in shares) at Sep. 30, 2021         146,362,598    
Ending balance at Sep. 30, 2021 $ 654,378       $ 1 $ 712,625 $ (58,248)