Leases - Supplemental cash flow information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 191	$ 379
Operating cash flows from short-term leases	10	19
Operating cash flows from finance leases	12	25
Financing cash flows from finance leases	79	157
Operating leases		4
Cash received from subleases	$ 112	$ 225