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Condensed Consolidated Statement of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (loss)
Accumulated Deficit
Redeemable Convertible Preferred Stock Beginning Balance (in shares) at Dec. 31, 2019 336,843,578        
Redeemable Convertible Preferred Stock Beginning Balance at Dec. 31, 2019 $ 335,748        
Redeemable Convertible Preferred Stock Ending Balance (in shares) at Mar. 31, 2020 336,843,578        
Redeemable Convertible Preferred Stock Ending Balance at Mar. 31, 2020 $ 335,748        
Balance at the beginning of the period (in shares) at Dec. 31, 2019   118,430,031      
Balance at the beginning of the period at Dec. 31, 2019 (198,406) $ 12 $ 7,365 $ 46 $ (205,829)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock upon exercise of vested options (in shares)   2,233,220      
Issuance of common stock upon exercise of vested options $ 173   173    
Issuance of common stock upon early exercise of unvested options ( in shares) 313,587        
Repurchase of early exercised stock options (in shares)   (142,726)      
Vesting of early exercised stock options $ 119   119    
Share-based compensation expense 3,745   3,745    
Change in other comprehensive income (loss) 21     21  
Net loss (14,530)       (14,530)
Balance at the end of the period (in shares) at Mar. 31, 2020   120,834,112      
Balance at the end of the period at Mar. 31, 2020 $ (208,878) $ 12 11,402 67 (220,359)
Redeemable Convertible Preferred Stock Beginning Balance (in shares) at Dec. 31, 2019 336,843,578        
Redeemable Convertible Preferred Stock Beginning Balance at Dec. 31, 2019 $ 335,748        
Redeemable Convertible Preferred Stock Ending Balance (in shares) at Sep. 30, 2020 351,844,340        
Redeemable Convertible Preferred Stock Ending Balance at Sep. 30, 2020 $ 501,881        
Balance at the beginning of the period (in shares) at Dec. 31, 2019   118,430,031      
Balance at the beginning of the period at Dec. 31, 2019 (198,406) $ 12 7,365 46 (205,829)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (33,935)        
Balance at the end of the period (in shares) at Sep. 30, 2020   129,085,150      
Balance at the end of the period at Sep. 30, 2020 $ (211,142) $ 13 28,454 155 (239,764)
Redeemable Convertible Preferred Stock Beginning Balance (in shares) at Mar. 31, 2020 336,843,578        
Redeemable Convertible Preferred Stock Beginning Balance at Mar. 31, 2020 $ 335,748        
Redeemable Convertible Preferred Stock          
Issuance of Series E-1 redeemable convertible preferred stock at $8.34 per share, net of issuance costs of $8,058 (in shares) 17,991,220        
Issuance of Series E-1 redeemable convertible preferred stock at $8.34 per share, net of issuance costs of $8,058 $ 143,109        
Redeemable Convertible Preferred Stock Ending Balance (in shares) at Jun. 30, 2020 354,834,798        
Redeemable Convertible Preferred Stock Ending Balance at Jun. 30, 2020 $ 478,857        
Balance at the beginning of the period (in shares) at Mar. 31, 2020   120,834,112      
Balance at the beginning of the period at Mar. 31, 2020 (208,878) $ 12 11,402 67 (220,359)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock upon exercise of vested options (in shares)   94,685      
Issuance of common stock upon exercise of vested options 44   44    
Issuance of common stock upon early exercise of unvested options ( in shares)   19,584      
Repurchase of early exercised stock options (in shares)   (28,206)      
Vesting of early exercised stock options 294   294    
Share-based compensation expense 2,918   2,918    
Change in other comprehensive income (loss) 231     231  
Net loss (7,107)       (7,107)
Balance at the end of the period (in shares) at Jun. 30, 2020   120,920,175      
Balance at the end of the period at Jun. 30, 2020 $ (212,498) $ 12 14,658 298 (227,466)
Redeemable Convertible Preferred Stock          
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares) (5,988,994)        
Conversion of redeemable convertible preferred stock to common stock upon initial public offering $ (809)        
Issuance of Series E-1 redeemable convertible preferred stock at $8.34 per share, net of issuance costs of $8,058 (in shares) 2,998,536        
Issuance of Series E-1 redeemable convertible preferred stock at $8.34 per share, net of issuance costs of $8,058 $ 23,833        
Redeemable Convertible Preferred Stock Ending Balance (in shares) at Sep. 30, 2020 351,844,340        
Redeemable Convertible Preferred Stock Ending Balance at Sep. 30, 2020 $ 501,881        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock upon exercise of vested options (in shares)   1,775,852      
Issuance of common stock upon exercise of vested options 893   893    
Issuance of common stock upon early exercise of unvested options ( in shares)   409,879      
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)   5,988,994      
Conversion of redeemable convertible preferred stock to common stock upon initial public offering 809 $ 1 808    
Repurchase of early exercised stock options (in shares)   (9,750)      
Vesting of early exercised stock options 138   138    
Share-based compensation expense 11,957   11,957    
Change in other comprehensive income (loss) (143)     (143)  
Net loss (12,298)       (12,298)
Balance at the end of the period (in shares) at Sep. 30, 2020   129,085,150      
Balance at the end of the period at Sep. 30, 2020 $ (211,142) $ 13 28,454 155 (239,764)
Redeemable Convertible Preferred Stock Beginning Balance (in shares) at Dec. 31, 2020 351,844,340        
Redeemable Convertible Preferred Stock Beginning Balance at Dec. 31, 2020 $ 501,881        
Redeemable Convertible Preferred Stock Ending Balance (in shares) at Mar. 31, 2021 351,844,340        
Redeemable Convertible Preferred Stock Ending Balance at Mar. 31, 2021 $ 501,881        
Balance at the beginning of the period (in shares) at Dec. 31, 2020   130,312,838      
Balance at the beginning of the period at Dec. 31, 2020 (213,717) $ 13 39,769 25 (253,524)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock upon exercise of vested options (in shares)   1,904,186      
Issuance of common stock upon exercise of vested options 1,410   1,410    
Issuance of common stock upon early exercise of unvested options ( in shares)   319,883      
Repurchase of early exercised stock options (in shares)   (18,567)      
Vesting of early exercised stock options 223   223    
Share-based compensation expense 11,392   11,392    
Change in other comprehensive income (loss) (45)     (45)  
Net loss (12,838)       (12,838)
Balance at the end of the period (in shares) at Mar. 31, 2021   132,518,340      
Balance at the end of the period at Mar. 31, 2021 $ (213,575) $ 13 52,794 (20) (266,362)
Redeemable Convertible Preferred Stock Beginning Balance (in shares) at Dec. 31, 2020 351,844,340        
Redeemable Convertible Preferred Stock Beginning Balance at Dec. 31, 2020 $ 501,881        
Redeemable Convertible Preferred Stock Ending Balance (in shares) at Sep. 30, 2021 0        
Redeemable Convertible Preferred Stock Ending Balance at Sep. 30, 2021 $ 0        
Balance at the beginning of the period (in shares) at Dec. 31, 2020   130,312,838      
Balance at the beginning of the period at Dec. 31, 2020 (213,717) $ 13 39,769 25 (253,524)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (127,122)        
Balance at the end of the period (in shares) at Sep. 30, 2021   539,777,025      
Balance at the end of the period at Sep. 30, 2021 $ 1,573,340 $ 54 1,954,315 (383) (380,646)
Redeemable Convertible Preferred Stock Beginning Balance (in shares) at Mar. 31, 2021 351,844,340        
Redeemable Convertible Preferred Stock Beginning Balance at Mar. 31, 2021 $ 501,881        
Redeemable Convertible Preferred Stock          
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares) (351,844,340)        
Conversion of redeemable convertible preferred stock to common stock upon initial public offering $ (501,881)        
Redeemable Convertible Preferred Stock Ending Balance (in shares) at Jun. 30, 2021 0        
Redeemable Convertible Preferred Stock Ending Balance at Jun. 30, 2021 $ 0        
Balance at the beginning of the period (in shares) at Mar. 31, 2021   132,518,340      
Balance at the beginning of the period at Mar. 31, 2021 (213,575) $ 13 52,794 (20) (266,362)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock upon exercise of vested options (in shares)   859,343      
Issuance of common stock upon exercise of vested options 1,161   1,161    
Issuance of common stock upon Initial public offering, net of issuance costs (in shares)   52,272,727      
Issuance of common stock upon initial public offering, net of issuance costs 1,312,338 $ 7 1,312,331    
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)   351,844,340      
Conversion of redeemable convertible preferred stock to common stock upon initial public offering 501,881 $ 34 501,847    
Reclassification of redeemable convertible preferred stock warrant liabilities to common stock and additional paid-in capital upon initial public offering 5,438   5,438    
Repurchase of early exercised stock options (in shares)   (9,897)      
Issuance of common stock net settlement of restricted stock units (in shares)   730,186      
Issuance of common stock upon net settlement of restricted stock units (10,273)   (10,273)    
Issuance of common stock upon exercise of common stock warrants (in shares)   668,412      
Vesting of common stock warrants 2,102   2,102    
Share-based compensation expense 55,536   55,536    
Change in other comprehensive income (loss) (68)     (68)  
Net loss (68,554)       (68,554)
Balance at the end of the period (in shares) at Jun. 30, 2021   538,883,451      
Balance at the end of the period at Jun. 30, 2021 $ 1,585,986 $ 54 1,920,936 (88) (334,916)
Redeemable Convertible Preferred Stock Ending Balance (in shares) at Sep. 30, 2021 0        
Redeemable Convertible Preferred Stock Ending Balance at Sep. 30, 2021 $ 0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock upon exercise of vested options (in shares)   153,374      
Issuance of common stock upon exercise of vested options 401   401    
Repurchase of early exercised stock options (in shares)   (37,621)      
Issuance of common stock net settlement of restricted stock units (in shares)   574,211      
Issuance of common stock upon net settlement of restricted stock units (8,175)   (8,175)    
Issuance of common stock upon exercise of common stock warrants (in shares)   203,610      
Issuance of common stock upon exercise of common stock warrants 60   60    
Vesting of common stock warrants 2,128   2,128    
Share-based compensation expense 38,965   38,965    
Change in other comprehensive income (loss) (295)     (295)  
Net loss (45,730)       (45,730)
Balance at the end of the period (in shares) at Sep. 30, 2021   539,777,025      
Balance at the end of the period at Sep. 30, 2021 $ 1,573,340 $ 54 $ 1,954,315 $ (383) $ (380,646)