Leases - Summary of Other Information Related to Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating cash flows from operating leases	$ 211	$ 165
Operating lease assets obtained in exchange for new lease liabilities	$ 1,336	$ 219
Weighted average remaining lease term	5 years 7 months 6 days	6 months
Weighted average discount rate	3.25%	5.00%