Leases - Components of lease costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Lease:
Total lease costs	$ 177	$ 193	$ 523	$ 568
Total lease costs, net of sublease interest income			521	567
Interest expense
Finance Lease:
Interest on lease liabilities	0	1	1	3
Selling, general and administrative
Operating Lease:
Operating lease cost	162	130	486	472
Short-term lease cost	$ 15	$ 62	36	93
Revenue.
Operating Lease:
Less sublease interest income			$ (2)	$ (1)