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Condensed Consolidated Statements of Changes in Temporary Equity and Stockholders' Equity (Deficit) - USD ($)
shares in Thousands, $ in Thousands
Total
Adjusted Balance
Common Stock
Common Stock
Adjustment
Common Stock
Adjusted Balance
Additional Paid-in Capital
Additional Paid-in Capital
Adjusted Balance
Accumulated Deficit
Accumulated Deficit
Adjusted Balance
Treasury Stock
Treasury Stock
Adjustment
Treasury Stock
Adjusted Balance
Preferred Stock to Common Stock
Series A Convertible Preferred Stock
Series A Convertible Preferred Stock
Adjustment
Series A Convertible Preferred Stock
Adjusted Balance
Series A-1 Convertible Preferred Stock
Series A-1 Convertible Preferred Stock
Adjustment
Series A-1 Convertible Preferred Stock
Adjusted Balance
Series A-2 Convertible Preferred Stock
Series A-2 Convertible Preferred Stock
Adjustment
Series A-2 Convertible Preferred Stock
Adjusted Balance
Series B Convertible Preferred Stock
Series B Convertible Preferred Stock
Adjustment
Series B Convertible Preferred Stock
Adjusted Balance
Series C Convertible Preferred Stock
Series C Convertible Preferred Stock
Adjustment
Series C Convertible Preferred Stock
Adjusted Balance
Beginning balance at Dec. 31, 2019 $ (121,503) $ (121,503)   $ 4,545 $ 4,545 $ (115,398) $ (115,398) $ (10,650)   $ (10,650)                                
Beginning balance, shares at Dec. 31, 2019     7,682 50,183 57,865         636 4,158 4,794                                
Temporary Equity, Balance at Dec. 31, 2019 154,300 154,300                       $ 14,921   $ 14,921 $ 7,470   $ 7,470 $ 7,463   $ 7,463 $ 49,845   $ 49,845 $ 74,601   $ 74,601
Temporary Equity, Balance, shares at Dec. 31, 2019                           2,775 18,132 20,907 1,448 9,457 10,905 1,105 7,217 8,322 7,751 50,639 58,390 3,765 24,593 28,358
Conversion of preferred stock to common stock                                                    
Issuance of Series C (extension) stock, net of offering costs 29,823                                                 $ 29,823    
Issuance of Series C (extension) stock, net of offering costs, shares                                                   11,627    
Stock-based compensation expense 875         875                                            
Net income (loss) (21,799)             (21,799)                                        
Ending balance at Sep. 30, 2020 (142,427)       5,420   (137,197)   $ (10,650)                                    
Ending balance, shares at Sep. 30, 2020     57,865             4,794                                    
Temporary Equity, Balance at Sep. 30, 2020 184,123                         $ 14,921     $ 7,470     $ 7,463     $ 49,845     $ 104,424    
Temporary Equity, Balance, shares at Sep. 30, 2020                           20,907     10,905     8,322     58,390     39,985    
Beginning balance at Jun. 30, 2020 (139,820) (139,820)   5,083 5,083 (134,253) (134,253) $ (10,650)   $ (10,650)                                
Beginning balance, shares at Jun. 30, 2020     7,682 50,183 57,865         636 4,158 4,794                                
Temporary Equity, Balance at Jun. 30, 2020 184,123 184,123                       $ 14,921   $ 14,921 $ 7,470   $ 7,470 $ 7,463     $ 49,845   $ 49,845 $ 104,424    
Temporary Equity, Balance, shares at Jun. 30, 2020                           2,775 18,132 20,907 1,448 9,457 10,905 1,105 7,217 8,322 7,751 50,639 58,390 5,308 34,677 39,985
Stock-based compensation expense 337         337                                            
Net income (loss) (2,944)             (2,944)                                        
Ending balance at Sep. 30, 2020 (142,427)       5,420   (137,197)   $ (10,650)                                    
Ending balance, shares at Sep. 30, 2020     57,865             4,794                                    
Temporary Equity, Balance at Sep. 30, 2020 184,123                         $ 14,921     $ 7,470     $ 7,463     $ 49,845     $ 104,424    
Temporary Equity, Balance, shares at Sep. 30, 2020                           20,907     10,905     8,322     58,390     39,985    
Beginning balance at Dec. 31, 2020 (143,258) (143,258)   5,908 5,908 (138,516) (138,516) $ (10,650)   $ (10,650)                                
Beginning balance, shares at Dec. 31, 2020     7,682 50,183 57,865         636 4,158 4,794                                
Temporary Equity, Balance at Dec. 31, 2020 184,123 $ 184,123                       $ 14,921   $ 14,921 $ 7,470   $ 7,470 $ 7,463   $ 7,463 $ 49,845   $ 49,845 $ 104,424   $ 104,424
Temporary Equity, Balance, shares at Dec. 31, 2020   8,322                       2,775 18,132 20,907 1,448 9,457 10,905 1,105 7,217 8,322 7,751 50,639 58,390 5,308 34,677 39,985
Issuance of common stock upon exercise of stock options $ 375         375                                            
Issuance of common stock upon exercise of stock options, shares 1,795   1,584                                                  
Issuance of common stock upon early exercise of stock options, shares     211                                                  
Vesting of early exercised stock options $ 171         171                                            
Conversion of preferred stock to common stock 184,123   $ 14     184,109       $ 10,650     $ (184,123) $ (14,921)     $ (7,470)     $ (7,463)     $ (49,845)     $ (104,424)    
Conversion of preferred stock to common stock, shares     138,612                     (20,907)     (10,905)     (8,322)     (58,390)     (39,985)    
Issuance of Class A common stock and Class B common stock in connection with Business Combination 206,347   $ 10     195,687       $ 10,650                                    
Issuance of Class A common stock and Class B common stock in connection with Business Combination, shares     40,073             (4,794)                                    
Stock-based compensation expense 2,316         2,316                                            
Net income (loss) (6,346)             (6,346)                                        
Ending balance at Sep. 30, 2021 243,728   $ 24     388,566   (144,862)                                        
Ending balance, shares at Sep. 30, 2021     238,345                                                  
Temporary Equity, Balance at Sep. 30, 2021 0                         $ 0     $ 0     $ 0     $ 0     $ 0    
Temporary Equity, Balance, shares at Sep. 30, 2021                           0   0 0   0 0   0 0   0 0   0
Beginning balance at Jun. 30, 2021 (132,556) $ (132,556)     7,653 $ 7,653 (129,559) $ (129,559) $ (10,650)   $ (10,650)                                
Beginning balance, shares at Jun. 30, 2021     7,920 51,740 59,660         636 4,158 4,794                                
Temporary Equity, Balance at Jun. 30, 2021 184,123 $ 184,123                       $ 14,921   $ 14,921 $ 7,470   $ 7,470 $ 7,463   $ 7,463 $ 49,845   $ 49,845 $ 104,424   $ 104,424
Temporary Equity, Balance, shares at Jun. 30, 2021                           2,775 18,132 20,907 1,448 9,457 10,905 1,105 7,217 8,322 7,751 50,639 58,390 5,308 34,677 39,985
Vesting of early exercised stock options 64         64                                            
Conversion of preferred stock to common stock                         $ (184,123) $ (14,921)     $ (7,470)     $ (7,463)     $ (49,845)     $ (104,424)    
Conversion of preferred stock to common stock, shares                           (20,907)     (10,905)     (8,322)     (58,390)     (39,985)    
Conversion of preferred stock to common stock 184,123   $ 14     184,109                                            
Conversion of preferred stock to common stock, shares     138,612                                                  
Issuance of Class A common stock and Class B common stock in connection with Business Combination 206,347   $ 10     195,687       $ 10,650                                    
Issuance of Class A common stock and Class B common stock in connection with Business Combination, shares     40,073             (4,794)                                    
Stock-based compensation expense 1,053         1,053                                            
Net income (loss) (15,303)             (15,303)                                        
Ending balance at Sep. 30, 2021 243,728   $ 24     $ 388,566   $ (144,862)                                        
Ending balance, shares at Sep. 30, 2021     238,345                                                  
Temporary Equity, Balance at Sep. 30, 2021 $ 0                         $ 0     $ 0     $ 0     $ 0     $ 0    
Temporary Equity, Balance, shares at Sep. 30, 2021                           0   0 0   0 0   0 0   0 0   0