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CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED AND COMMON STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Total
Series A Convertible Preferred Stock
Series A-1 Convertible Preferred Stock
Series B Convertible Preferred Stock
Class B Convertible Common Stock
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Income
Beginning balance, temporary equity (in shares) at Dec. 31, 2023   21,977,282 2,950,548 28,019,181 2,744,184        
Beginning balance, temporary equity at Dec. 31, 2023   $ 44,621 $ 9,893 $ 82,976 $ 5,900        
Convertible Preferred and Common Stock                  
Conversion of convertible preferred stock and Class B convertible common stock to common stock as a result of the Merger and reset to par of $0.00001 (in shares)   (21,977,282) (2,950,548) (28,019,181) (2,744,184)        
Conversion of convertible preferred stock and Class B convertible common stock to common stock as a result of the Merger and reset to par of $0.00001   $ (44,621) $ (9,893) $ (82,976) $ (5,900)        
Ending balance, temporary equity (in shares) at Dec. 31, 2024   0 0 0 0        
Ending balance, temporary equity at Dec. 31, 2024   $ 0 $ 0 $ 0 $ 0        
Beginning balance, common stock (in shares) at Dec. 31, 2023           1,969,360      
Beginning balance at Dec. 31, 2023 $ (92,712)         $ 10 $ 2,517 $ (95,245) $ 6
Stockholders' Deficit                  
Conversion of convertible preferred stock and Class B convertible common stock to common stock as a result of the Merger and reset to par of $0.00001 (in shares)           11,260,672      
Conversion of convertible preferred stock and Class B convertible common stock to common stock as a result of the Merger and reset to par of $0.00001 143,390         $ (10) 143,400    
Issuance of common stock to Graphite stockholders as a result of the Merger (in shares)           8,320,485      
Issuance of common stock to Graphite stockholders as a result of the Merger 116,145           116,145    
Issuance of common stock from private placement, net (in shares)           5,138,512      
Issuance of common stock from private placements, net 79,513           79,513    
Reclassification of warrant liability to equity 1,918           1,918    
Merger transaction costs (5,070)           (5,070)    
Unrealized gain on marketable securities 190               190
Exercise of stock options and common warrants (in shares)           801,983      
Exercise of stock options and common warrants 4,038         $ 1 4,037    
Vesting of early exercised stock options (in shares)           27,427      
Vesting of early exercised stock options 76           76    
Share-based compensation $ 6,365           6,365    
Exercise of stock warrants (in shares) 0                
Net loss $ (49,769)             (49,769)  
Ending balance, common stock (in shares) at Dec. 31, 2024 27,518,439         27,518,439      
Ending balance at Dec. 31, 2024 $ 204,084         $ 1 348,901 (145,014) 196
Beginning balance, temporary equity (in shares) at Mar. 20, 2024   21,977,282 2,950,548            
Stockholders' Deficit                  
Issuance of common stock to Graphite stockholders as a result of the Merger (in shares) 8,320,485                
Issuance of common stock from private placement, net (in shares) 8,670,653                
Merger transaction costs $ (5,200)                
Beginning balance, temporary equity (in shares) at Dec. 31, 2024   0 0 0 0        
Ending balance, temporary equity (in shares) at Dec. 31, 2025   0 0 0 0        
Ending balance, temporary equity at Dec. 31, 2025   $ 0 $ 0 $ 0 $ 0        
Stockholders' Deficit                  
Issuance of common stock from private placement, net (in shares)           3,618,634      
Issuance of common stock from private placements, net 147,749           147,749    
Exercise stock options (in shares)           158,858      
Exercise of stock options 1,123           1,123    
Unrealized gain on marketable securities 46               46
Vesting of early exercised stock options (in shares)           13,051      
Vesting of early exercised stock options 44           44    
Share-based compensation $ 12,547           12,547    
Exercise of stock warrants (in shares) 554         554      
Issuance of common stock under employee stock purchase plan (in shares)           35,246      
Issuance of common stock under employee stock purchase plan $ 873           873    
Net loss $ (82,127)             (82,127)  
Ending balance, common stock (in shares) at Dec. 31, 2025 31,344,782         31,344,782      
Ending balance at Dec. 31, 2025 $ 284,339         $ 1 $ 511,237 $ (227,141) $ 242