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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK OPTIONS AND EMPLOYEE STOCK PURCHASE PLAN (Details)
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
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) 77.70% 77.70%
Expected volatility range, maximum (as a percent) 81.60% 78.30%
Risk-free interest rate range, minimum (as a percent) 1.69% 0.51%
Risk-free interest rate range, maximum (as a percent) 3.77% 0.94%
Expected term 5 years 6 months 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) 61.37% 50.70%
Expected volatility range, maximum (as a percent) 86.48% 70.70%
Risk-free interest rate range, minimum (as a percent) 0.40% 0.09%
Risk-free interest rate range, maximum (as a percent) 2.79% 0.16%
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