Leases - Summary of Other Information Related to Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Leases [Abstract]
Operating cash flows from operating leases	$ 262	$ 211
Operating lease assets obtained in exchange for new lease liabilities	$ 0	$ 1,336
Weighted average remaining lease term	4 years 8 months 12 days	5 years 7 months 6 days
Weighted average discount rate	3.25%	3.25%