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STOCK OPTIONS, RESTRICTED STOCK UNITS (RSUs) AND WARRANTS - Stock option activity (Details) - USD ($)
9 Months Ended 12 Months Ended
Jun. 30, 2023
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding at the beginning 8,174,563  
Grants 502,431  
Exercised 22,462  
Forfeited (98,972)  
Outstanding at the end 8,555,560 8,174,563
Exercisable 6,772,308  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Outstanding at the beginning $ 3.78  
Grants 4.35  
Exercised 1.71  
Forfeited 5.81  
Outstanding at the end 3.90 $ 3.78
Exercisable $ 3.53  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Weighted average remaining contractual term, outstanding 7 years 4 months 28 days 7 years 5 months 1 day
Weighted average remaining contractual term, grants 10 years  
Exercisable 7 years 29 days  
Outstanding at the beginning $ 9,188,491  
Outstanding at the end 656,612 $ 9,188,491
Exercisable at the end $ 671,885