LEASES - Weighted average remaining lease (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Mar. 31, 2021	Mar. 31, 2020
Cash flows included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 240	$ 469
Operating cash flows from finance leases	68	137
Finance cash flows from finance leases	103	206	$ 212
Non-cash lease activity:
Right-of-use assets obtained in exchange for new operating lease liabilities	772	1,175
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 9	$ 0
Operating lease, weighted-average remaining lease term (in years)	4 years 5 months 27 days	4 years 5 months 27 days
Finance lease, weighted-average remaining lease term (in years)	4 months 13 days	4 months 13 days
Operating lease, weighted-average discount rate (in percentages)	5.24%	5.24%
Finance lease, weighted-average discount rate (in percentages)	5.82%	5.82%