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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Loss per Common Share (Details) - shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Loss Per Common Share [Abstract]    
Potentially dilutive securities (in shares) 16,828,915 9,407,511
Stock Options [Member]    
Loss Per Common Share [Abstract]    
Potentially dilutive securities (in shares) 7,831,622 6,938,351
Restricted Stock Units [Member]    
Loss Per Common Share [Abstract]    
Potentially dilutive securities (in shares) 4,469,133 331,000
Warrants [Member]    
Loss Per Common Share [Abstract]    
Potentially dilutive securities (in shares) 4,528,160 2,138,160