Leases - Supplemental Cash Flow Information and Non-Cash Activity Schedule (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash paid for amounts included in measurement of liabilities:
Operating cash flows from operating leases	$ 1,952	$ 2,173
Operating cash flows from finance leases	2	5
Financing cash flows from finance leases	59	57
Right-of-use assets obtained in exchange for new lease liabilities:
Operating leases	$ 43	$ 278