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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK OPTIONS AND EMPLOYEE STOCK PURCHASE PLAN (Details)
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Stock Options    
Stock-Based Compensation    
Vesting period of awards 4 years  
Assumptions used to estimate fair value of awards    
Dividend yield (as a percent) 0.00% 0.00%
Expected volatility range, minimum (as a percent) 82.94% 81.53%
Expected volatility range, maximum (as a percent) 86.68% 82.12%
Risk-free interest rate range, minimum (as a percent) 3.53% 3.42%
Risk-free interest rate range, maximum (as a percent) 4.62% 4.62%
Expected term 6 years 6 years
Employee Stock Purchase Plan    
Assumptions used to estimate fair value of awards    
Dividend yield (as a percent) 0.00% 0.00%
Expected volatility range, minimum (as a percent) 72.08% 79.05%
Expected volatility range, maximum (as a percent) 119.00% 83.22%
Risk-free interest rate range, minimum (as a percent) 4.79% 4.73%
Risk-free interest rate range, maximum (as a percent) 5.37% 5.40%
Employee Stock Purchase Plan | Minimum    
Assumptions used to estimate fair value of awards    
Expected term 6 months 6 months
Employee Stock Purchase Plan | Maximum    
Assumptions used to estimate fair value of awards    
Expected term 12 months 12 months