WARRANTS, STOCK OPTIONS AND RESTRICTED STOCK UNITS - Transactions involving warrants (Details)	6 Months Ended
	Mar. 31, 2023 $ / shares shares
Number of Shares
Balance at October 1, 2022 | shares	7,313,963
Cancelled or expired | shares	(18,375)
Balance at March 31, 2023 | shares	7,295,588
Weighted Average Exercise Price Per Share
Balance at October 1, 2022 | $ / shares	$ 3.68
Cancelled or expired | $ / shares	17.60
Balance at March 31, 2023 | $ / shares	$ 3.65