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STOCK-BASED COMPENSATION - Stock Options Valuations Assumptions (Details) - $ / shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of common stock (in dollars per share)   $ 0.60
Expected volatility, minimum   33.90%
Expected volatility, maximum   38.20%
Risk-free interest rate, minimum   0.30%
Risk-free interest rate, maximum   1.50%
Expected dividend yield 0.00% 0.00%
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected term   5 years 4 months 24 days
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected term   6 years 1 month 6 days