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