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CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT - Estimate the fair value of warrants granted (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Assumptions used to estimate the fair value of stock options granted    
Risk-free interest rate, minimum 0.47% 0.30%
Risk-free interest rate, maximum 0.66% 1.41%
Expected volatility, minimum 49.83% 43.11%
Expected volatility, maximum 49.98% 50.14%
Minimum    
Assumptions used to estimate the fair value of stock options granted    
Expected term (in years) 5 years 9 months 21 days 5 years 3 months 25 days
Maximum    
Assumptions used to estimate the fair value of stock options granted    
Expected term (in years) 5 years 10 months 20 days 6 years 1 month 20 days
Warrants | Minimum    
Assumptions used to estimate the fair value of stock options granted    
Risk-free interest rate, minimum 0.90%  
Expected term (in years) 5 years  
Expected volatility, minimum 59.00%  
Warrants | Maximum    
Assumptions used to estimate the fair value of stock options granted    
Risk-free interest rate, maximum 1.30%  
Expected term (in years) 10 years  
Expected volatility, maximum 69.00%