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STOCK-BASED COMPENSATION - Summary of Company's Stock Option Activity (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 22, 2021
Sep. 30, 2021
Dec. 31, 2020
Options      
Outstanding at beginning of period (in shares)   8,344,752  
Granted (in shares) 128,000 2,975,821  
Exercised (in shares)   (1,698,265)  
Forfeited (in shares)   (310,816)  
Expired (in shares)   (107,792)  
Outstanding at end of period (in shares)   9,203,700 8,344,752
Weighted Average Exercise Price      
Outstanding at end of period (in dollars per share)   $ 4.99 $ 0.61
Granted (in dollars per share)   15.61  
Exercised (in dollars per share)   0.30  
Forfeited (in dollars per share)   10.31  
Expired (in dollars per share)   0.37  
Outstanding at beginning of period (in dollars per share)   $ 0.61  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options, exercisable (in shares)   5,775,902  
Options, vested and expected to vest (in shares)   9,260,605  
Weighted average exercise price, exercisable (in dollars per share)   $ 1.02  
Weighted average exercise price, vested and expected to vest (in dollars per share)   $ 4.49  
Weighted average remaining contractual term (years), outstanding   4 years 10 months 17 days 6 years 5 months 8 days
Weighted average remaining contractual term (years), exercisable   5 years 9 months 14 days  
Weighted average remaining contractual term (years), vested and expected to vest   6 years 5 months 26 days