Leases - Components of lease costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating Lease:
Total lease costs	$ 193	$ 195	$ 568	$ 584
Total lease costs, net of sublease interest income	193	193	567	564
Interest expense
Finance Lease:
Interest on lease liabilities	1	2	3	10
Selling, general and administrative
Operating Lease:
Operating lease cost	130	170	472	538
Short-term lease cost	62	23	93	36
Revenue.
Operating Lease:
Less sublease interest income	$ 0	$ (2)	$ (1)	$ (20)