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Leases - Components of lease costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Operating Lease:    
Total lease costs $ 192 $ 196
Total lease costs, net of sublease interest income 192 185
Interest expense    
Finance Lease:    
Interest on lease liabilities 1 5
Selling, general, and administrative    
Operating Lease:    
Operating lease cost 179 188
Short-term lease cost $ 12 3
Revenue.    
Operating Lease:    
Less sublease interest income   $ (11)