Leases - Supplemental cash flow information (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 495	$ 486
Operating cash flows from short-term leases	36	93
Operating cash flows from finance leases	1	3
Financing cash flows from finance leases	4	35
Operating leases	392	23
Cash received from subleases	$ 15	$ 51