Leases - Supplemental cash flow information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 633	$ 740
Operating cash flows from short-term leases	137	47
Operating cash flows from finance leases	4	11
Financing cash flows from finance leases	47	274
Operating leases	352	0
Cash received from subleases	$ (49)	$ (356)