Leases - Supplemental cash flow information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 191	$ 188
Operating cash flows from short-term leases	10	9
Operating cash flows from finance leases	5	13
Financing cash flows from finance leases	86	78
Operating leases		4
Cash received from subleases	$ 113	$ 113