Leases - Components of lease costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Lease:
Total lease costs	$ 756	$ 776
Total lease costs, net of sublease interest income	755	756
Interest expense
Finance Lease:
Interest on lease liabilities	4	11
Selling, general and administrative
Operating Lease:
Operating lease cost	615	718
Short-term lease cost	137	47
Revenue.
Operating Lease:
Less sublease interest income	$ (1)	$ (20)