Leases - Right of use assets and lease liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Oct. 01, 2019	Sep. 30, 2019
Assets:
Operating leases	$ 2,014	$ 2,448
Lease receivable - current	336	367	$ 367
Lease receivable - noncurrent	81	417	417
Total lease receivable	417	784
Liabilities
Current operating lease liabilities	$ 679	$ 746
Current operating lease liabilities, Statement of Financial Position	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Non-current operating lease liabilities	$ 1,390	$ 1,783
Lease Liabilities	2,069	2,529
Current finance lease liabilities	$ 274	$ 334	$ 334
Current finance lease liabilities, Statement of Financial Position	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Non-current finance lease liabilities	$ 52	$ 324
Non-current finance lease liabilities, Statement of Financial Position	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Total finance lease liabilities	$ 326	$ 658