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Stockholders' Equity and Share-Based Compensation - Assumptions Used in Determining Fair Value & Early exercise of Stock Options (Details) - Employee Stock Option
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Expected volatility 93.40% 93.70%
Risk-free interest rate 4.00% 4.10%
Expected term 5 years 6 months 5 years 10 months 24 days