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Convertible Preferred Stock and Stockholders' Equity - Stock option activity under all equity and stock option plans (Details) - Employee And Non Employee Stock Option
 9 Months Ended
Sep. 30, 2025
$ / shares
shares
Number of Options  
Balance at the beginning of the period | shares 10,722,674
Granted | shares 3,690,400
Exercised | shares (832)
Cancelled | shares (1,814,843)
Balance at the end of the period | shares 12,597,399
Weighted-Average Price  
Balance at the beginning of the period | $ / shares $ 10.99
Granted | $ / shares 1.29
Exercised | $ / shares 1.32
Cancelled | $ / shares 7.45
Balance at the end of the period | $ / shares $ 8.66