Leases - Components of lease costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Operating Lease:
Total lease costs	$ 142	$ 143	$ 424	$ 424
Total lease costs, net of sublease interest income	139	142	417	422
Selling, general and administrative
Operating Lease:
Operating lease cost	134	134	400	398
Short-term lease cost	8	9	24	26
Revenue
Operating Lease:
Less sublease interest income	$ (3)	$ (1)	$ (7)	$ (2)