SEGMENT AND GEOGRAPHIC INFORMATION - GEOGRAPHIC AREAS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Geographic information
Long-lived assets	$ 5,695	$ 9,598
Total (excluding interest income)	18,329	12,013
United States
Geographic information
Long-lived assets	3,393	3,366
Total (excluding interest income)	11,325	5,515
Canada
Geographic information
Long-lived assets	2,302	6,232
Total (excluding interest income)	$ 7,004	$ 6,498