Leases - Components of lease costs (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2020 USD ($)
Operating Lease:
Total lease costs	$ 777
Total lease costs, net of sublease interest income	694
Selling, general, and administrative
Finance Lease:
Interest on lease liabilities	30
Operating Lease:
Operating lease cost	735
Short-term Lease, Cost	12
Revenue
Operating Lease:
Less sublease interest income	$ (83)