Leases - Components of lease costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Operating Lease:
Total lease costs	$ 193	$ 196	$ 389	$ 392
Total lease costs, net of sublease interest income	186	173	371	343
Selling, general, and administrative
Finance Lease:
Interest on lease liabilities	3	12	8	25
Operating Lease:
Operating lease cost	180	181	368	361
Short-term Lease, Cost	10	3	13	6
Revenue
Operating Lease:
Less sublease interest income	$ (7)	$ (23)	$ (18)	$ (49)