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Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
shares in Thousands, $ in Thousands
Total
Redeemable Convertible Preferred Stock
Common Stock
Additional Paid-in Capital
Accumulated Deficit
IPO
IPO
Redeemable Convertible Preferred Stock
IPO
Common Stock
IPO
Additional Paid-in Capital
IPO
Accumulated Deficit
Series C Preferred Stock
Redeemable Convertible Preferred Stock
Series D-1 Preferred Stock
Redeemable Convertible Preferred Stock
Series D-3 Preferred Stock
Redeemable Convertible Preferred Stock
Series D-4 Preferred Stock
Redeemable Convertible Preferred Stock
Series M Preferred Stock
Redeemable Convertible Preferred Stock
Preferred Stock, Shares Outstanding   29,760                          
Common stock, shares, outstanding, beginning balance (in shares) at Dec. 31, 2023     12,410                        
Equity, beginning balance at Dec. 31, 2023 $ (504,485) $ 535,864 $ 1 $ 0 $ (504,486)                    
Preferred stock beginning balance (in shares) at Dec. 31, 2023   29,760                          
Issuance of common stock under equity plan (in shares)     179                        
Issuance of common stock under equity plan 224     224                      
Stock-based compensation 409     409                      
Issuance of stock, net (in shares)                     1,307       68
Issuance of stock, net                     $ 21,000       $ 1,090
Accretion of redeemable convertible preferred stock (5,219) $ 5,219   (633) (4,586)                    
Net Income (Loss) (52,771)       (52,771)                    
Common stock, shares, outstanding, ending balance (in shares) at Mar. 31, 2024     12,589                        
Equity, ending balance at Mar. 31, 2024 (561,842) $ 563,173 $ 1 0 (561,843)                    
Preferred stock ending balance (in shares) at Mar. 31, 2024   31,135                          
Common stock, shares, outstanding, beginning balance (in shares) at Dec. 31, 2023     12,410                        
Equity, beginning balance at Dec. 31, 2023 (504,485) $ 535,864 $ 1 0 (504,486)                    
Preferred stock beginning balance (in shares) at Dec. 31, 2023   29,760                          
Closing Preferred Stock Dividend 0                            
Conversion of Preferred Stock to common stock 0                            
Net exercise of Common Warrants into common stock 0                            
Net Income (Loss) (147,014)                            
Common stock, shares, outstanding, ending balance (in shares) at Sep. 30, 2024     12,994                        
Equity, ending balance at Sep. 30, 2024 (665,460) $ 573,919 $ 1 0 (665,461)                    
Preferred stock ending balance (in shares) at Sep. 30, 2024   31,141                          
Preferred Stock, Shares Outstanding   31,135                          
Common stock, shares, outstanding, beginning balance (in shares) at Mar. 31, 2024     12,589                        
Equity, beginning balance at Mar. 31, 2024 (561,842) $ 563,173 $ 1 0 (561,843)                    
Preferred stock beginning balance (in shares) at Mar. 31, 2024   31,135                          
Issuance of common stock under equity plan (in shares)     284                        
Issuance of common stock under equity plan 214     214                      
Stock-based compensation 425     425                      
Issuance of stock, net (in shares)                             6
Issuance of stock, net                             $ 96
Accretion of redeemable convertible preferred stock (5,296) $ 5,296   (639) (4,657)                    
Net Income (Loss) (53,453)       (53,453)                    
Common stock, shares, outstanding, ending balance (in shares) at Jun. 30, 2024     12,873                        
Equity, ending balance at Jun. 30, 2024 619,952 $ 568,565 $ 1 0 (619,953)                    
Preferred stock ending balance (in shares) at Jun. 30, 2024   31,141                          
Preferred Stock, Shares Outstanding   31,141                          
Issuance of common stock under equity plan (in shares)     121                        
Issuance of common stock under equity plan 174     174                      
Stock-based compensation 462     462                      
Accretion of redeemable convertible preferred stock (5,354) $ 5,354   (636) (4,718)                    
Net Income (Loss) (40,790)       (40,790)                    
Common stock, shares, outstanding, ending balance (in shares) at Sep. 30, 2024     12,994                        
Equity, ending balance at Sep. 30, 2024 $ (665,460) $ 573,919 $ 1 0 (665,461)                    
Preferred stock ending balance (in shares) at Sep. 30, 2024   31,141                          
Preferred Stock, Shares Outstanding   31,141                          
Preferred Stock, Shares Outstanding   41,588                          
Common stock, shares, outstanding, beginning balance (in shares) at Dec. 31, 2024 13,241   13,241                        
Equity, beginning balance at Dec. 31, 2024 $ (767,622) $ 759,582 $ 1 0 (767,623)                    
Preferred stock beginning balance (in shares) at Dec. 31, 2024   41,588                          
Issuance of common stock under equity plan (in shares)     489                        
Issuance of common stock under equity plan 748   $ 1 747                      
Stock-based compensation 431     431                      
Stock-based compensation (in shares)     15                        
Issuance of stock, net (in shares)                       6,858      
Issuance of stock, net                       $ 115,304      
Accretion of redeemable convertible preferred stock (12,188) $ 12,188   (1,178) (11,010)                    
Net Income (Loss) (60,093)       (60,093)                    
Common stock, shares, outstanding, ending balance (in shares) at Mar. 31, 2025     13,745                        
Equity, ending balance at Mar. 31, 2025 $ (838,724) $ 887,074 $ 2 0 (838,726)                    
Preferred stock ending balance (in shares) at Mar. 31, 2025   48,446                          
Common stock, shares, outstanding, beginning balance (in shares) at Dec. 31, 2024 13,241   13,241                        
Equity, beginning balance at Dec. 31, 2024 $ (767,622) $ 759,582 $ 1 0 (767,623)                    
Preferred stock beginning balance (in shares) at Dec. 31, 2024   41,588                          
Closing Preferred Stock Dividend 4,990                            
Conversion of Preferred Stock to common stock 937,087                            
Net exercise of Common Warrants into common stock 46,060                            
Net Income (Loss) $ (257,283)                            
Common stock, shares, outstanding, ending balance (in shares) at Sep. 30, 2025 148,138   148,138                        
Equity, ending balance at Sep. 30, 2025 $ 948,821 $ 0 $ 16 1,928,027 (979,222)                    
Preferred stock ending balance (in shares) at Sep. 30, 2025   0                          
Preferred Stock, Shares Outstanding   48,446                          
Common stock, shares, outstanding, beginning balance (in shares) at Mar. 31, 2025     13,745                        
Equity, beginning balance at Mar. 31, 2025 (838,724) $ 887,074 $ 2 0 (838,726)                    
Preferred stock beginning balance (in shares) at Mar. 31, 2025   48,446                          
Issuance of common stock under equity plan (in shares)     263                        
Issuance of common stock under equity plan 231     231                      
Stock-based compensation 760     760                      
Issuance of stock, net (in shares)                       3,546 551    
Issuance of stock, net                       $ 59,812 $ 10,000    
Accretion of redeemable convertible preferred stock (16,485) $ 16,485   (991) (15,494)                    
Net Income (Loss) (63,778)       (63,778)                    
Common stock, shares, outstanding, ending balance (in shares) at Jun. 30, 2025     14,008                        
Equity, ending balance at Jun. 30, 2025 (917,996) $ 973,371 $ 2 0 (917,998)                    
Preferred stock ending balance (in shares) at Jun. 30, 2025   52,543                          
Preferred Stock, Shares Outstanding   52,543                          
Issuance of common stock under equity plan (in shares)     1,833                        
Issuance of common stock under equity plan 1,656   $ 1 1,655                      
Stock-based compensation 4,000     4,000                      
Issuance of stock, net (in shares)                           2,811  
Issuance of stock, net                           $ 47,880  
Accretion of redeemable convertible preferred stock (6,950) $ 6,950   (0) (6,950)                    
Issuance of Common Stock to Settle Preferred Stock Dividend amount 86,124 (86,124)   11,976 74,148                    
Issuance of Common Stock to Settle Preferred Stock Dividend Shares     3,251                        
Issuance Of Underwriting Discounts And Commissions And Other Offering Costs           $ 932,333   $ 2 $ 932,331            
Issuance Of Underwriting Discounts And Commissions And Other Offering Costs, Shares               22,190              
Closing Preferred Stock Dividend             $ (4,990)   (4,990) $ 4,990          
Conversion of Preferred Stock to common stock           $ (937,006) $ (937,087) $ 11 $ 936,995            
Conversion of Preferred Stock to common stock, Shares             (55,354) 105,832              
Net exercise of Common Warrants into common stock 46,060     46,060                      
Net exercise of Common Warrants into common stock, Shares     1,024                        
Net Income (Loss) $ (133,412)       (133,412)                    
Common stock, shares, outstanding, ending balance (in shares) at Sep. 30, 2025 148,138   148,138                        
Equity, ending balance at Sep. 30, 2025 $ 948,821 $ 0 $ 16 $ 1,928,027 $ (979,222)                    
Preferred stock ending balance (in shares) at Sep. 30, 2025   0                          
Preferred Stock, Shares Outstanding   0