Leases - Supplemental cash flow information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 131	$ 177	$ 486	$ 553
Operating cash flows from short-term leases	62	23	93	36
Operating cash flows from finance leases	1	2	3	10
Financing cash flows from finance leases	12	89	35	262
Operating leases	23	0	23	0
Cash received from subleases	$ 17	$ 113	$ 51	$ 338