Leases - Right of use assets and lease liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Oct. 01, 2019
Assets:
Operating leases	$ 2,131	$ 2,448
Lease receivable - current	399	367
Lease receivable - noncurrent	207	417
Total lease receivable	606	784
Liabilities
Current operating lease liabilities	$ 667	746
Current operating lease liabilities, Statement of Financial Position	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Non-current operating lease liabilities	$ 1,529	1,783
Total operating lease liabilities	2,196	2,529
Current finance lease liabilities	$ 343	333
Current finance lease liabilities, Statement of Financial Position	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Non-current finance lease liabilities	$ 152	326
Non-current finance lease liabilities, Statement of Financial Position	us-gaap:OtherLiabilitiesNoncurrent
Total finance lease liabilities	$ 495	$ 659