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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK OPTIONS AND EMPLOYEE STOCK PURCHASE PLAN (Details)
 3 Months Ended
Mar. 31, 2024
Mar. 31, 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% 81.64%
Risk-free interest rate range, minimum (as a percent) 4.05% 3.42%
Risk-free interest rate range, maximum (as a percent) 4.32% 4.10%
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) 59.46% 61.04%
Expected volatility range, maximum (as a percent) 79.05% 81.08%
Risk-free interest rate range, minimum (as a percent) 4.79% 0.09%
Risk-free interest rate range, maximum (as a percent) 5.40% 4.76%
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