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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK OPTIONS AND EMPLOYEE STOCK PURCHASE PLAN (Details)
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
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) 81.50% 77.70%
Expected volatility range, maximum (as a percent) 81.90% 79.90%
Risk-free interest rate range, minimum (as a percent) 3.40% 1.70%
Risk-free interest rate range, maximum (as a percent) 4.10% 3.40%
Expected term 6 years 5 years 6 months
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) 61.00% 50.90%
Expected volatility range, maximum (as a percent) 81.10% 61.40%
Risk-free interest rate range, minimum (as a percent) 0.10% 0.10%
Risk-free interest rate range, maximum (as a percent) 4.80% 0.40%
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