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EQUITY-BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Shares        
Outstanding, beginning balance (in shares) 1,563,972 166,233 166,233  
Granted (in shares) 79,000 743,118    
Exercised (in shares) 0 0    
Forfeited (in shares) (45,000) (36,613)    
Expired (in shares) 0 (30,766)    
Outstanding, ending balance (in shares) 1,597,972 841,972 1,563,972 166,233
Exercisable (in shares) 323,730 69,813    
Weighted-Average Exercise Price        
Weighted-average exercise price, beginning balance (in dollar per share) $ 2.78 $ 34.42 $ 34.42  
Granted, weighted-average exercise price (in dollar per share)   0.61    
Forfeited, weighted-average exercise price (in dollar per share)   0    
Weighted-average exercise price, ending balance (in dollar per share) 2.75 4.55 $ 2.78 $ 34.42
Exercisable, weighted-average exercise price (in dollar per share) $ 9.27 $ 37.84    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]        
Outstanding, weighted-average remaining contractual term 8 years 9 months 9 years 3 months 25 days 9 years 5 months 19 days 6 years 6 months 10 days
Exercisable, weighted-average remaining contractual term 7 years 8 months 26 days 5 years 5 months 4 days    
Outstanding, aggregate intrinsic value $ 271,540 $ 175,770 $ 0
Exercisable, aggregate intrinsic value $ 34,440 $ 0    
Minimum        
Weighted-Average Exercise Price        
Granted, weighted-average exercise price (in dollar per share) $ 1.04      
Maximum        
Weighted-Average Exercise Price        
Granted, weighted-average exercise price (in dollar per share) $ 1.49