Leases - Supplemental Cash Flow Information and Non-Cash Activity Schedule (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash paid for amounts included in measurement of liabilities:
Operating cash flows from operating leases	$ 1,097	$ 1,086
Operating cash flows from finance leases	2	3
Financing cash flows from finance leases	29	28
Right-of-use assets obtained in exchange for new lease liabilities:
Operating leases	$ 43	$ 278