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Convertible Preferred Stock and Stockholders' Equity - Weighted average assumptions used in the Black-Scholes option pricing model (Details) - Employee And Non Employee Stock Option
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Weighted-average assumptions to determine fair value of stock options    
Risk-free interest rate 4.40% 3.90%
Expected volatility 90.40% 87.10%
Expected term (in years) 6 years 2 months 12 days 6 years 4 months 24 days
Expected dividend yield 0.00% 0.00%