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Leases - Right of use assets and lease liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Oct. 01, 2019
Sep. 30, 2019
Assets:      
Operating leases $ 2,180 $ 2,448  
Lease receivable - current 416 367 $ 367
Lease receivable - noncurrent 103 417 $ 417
Total lease receivable 519 784  
Liabilities      
Current operating lease liabilities $ 678 746  
Current operating lease liabilities, Statement of Financial Position us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent    
Non-current operating lease liabilities $ 1,562 1,783  
Total operating lease liabilities 2,240 2,529  
Current finance lease liabilities $ 348 334  
Current finance lease liabilities, Statement of Financial Position us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent    
Non-current finance lease liabilities $ 63 324  
Non-current finance lease liabilities, Statement of Financial Position us-gaap:OtherLiabilitiesNoncurrent    
Total finance lease liabilities $ 411 $ 658