Leases - Components of lease costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Lease:
Total lease costs	$ 196	$ 196
Total lease costs, net of sublease interest income	185	170
Selling, general, and administrative
Finance Lease:
Interest on lease liabilities	5	13
Operating Lease:
Operating lease cost	188	180
Short-term Lease, Cost	3	3
Revenue
Operating Lease:
Less sublease interest income	$ (11)	$ (26)