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SHAREHOLDERS' EQUITY (Summary of Stock Option Activity) (Details) - $ / shares
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Number of Options      
Beginning balance (in shares) 5,309,584 1,122,461 900,459
Options granted (in shares) 1,889,646 4,218,000 255,000
Options exercised (in shares) (323,610) (416)  
Options expired/forfeited (in shares) (72,390) (30,461) (32,998)
Ending balance (in shares) 6,803,230 5,309,584 1,122,461
Balance exercisable (in shares) 2,799,226    
Weighted Average Exercise Price      
Beginning balance (in dollars per share) $ 3.42 $ 4.59 $ 4.59
Options granted (in dollars per share) 9.87 3.31 3.77
Options exercised (in dollars per share) (3.68) (2.20)  
Options expired/forfeited (in dollars per share) (4.46) (28.46) (4.10)
Ending balance (in dollars per share) 5.20 $ 3.42 $ 4.59
Options exercisable (in dollars per share) $ 3.49