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Stock-Based Compensation - Assumptions (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
OnkosXcel PSU      
Stock-Based Compensation      
Expected term     5 years 9 months 18 days
Expected stock price volatility (as a percent)     97.40%
Risk-free rate of interest (as a percent)     3.60%
Expected dividend yield (as a percent)     0.00%
Employee Stock Option      
Stock-Based Compensation      
Expected stock price volatility, minimum (as a percent) 108.00% 96.60%  
Expected stock price volatility, maximum (as a percent) 112.50% 109.20%  
Risk-free rate of interest, minimum (as a percent) 4.00% 3.50%  
Risk-free rate of interest, maximum (as a percent) 4.50% 4.40%  
Expected dividend yield (as a percent) 0.00%    
Employee Stock Option | Minimum      
Stock-Based Compensation      
Expected term 5 years 6 months 5 years 6 months  
Expected dividend yield (as a percent) 0.00% 0.00%  
Employee Stock Option | Maximum      
Stock-Based Compensation      
Expected term 6 years 1 month 6 days 6 years 1 month 6 days  
Expected dividend yield (as a percent)   0.00%