Leases - Right of use assets and lease liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Oct. 01, 2019
Assets:
Operating leases	$ 2,288	$ 2,448
Lease receivable - current	383	367
Lease receivable - noncurrent	319	417
Total lease receivable	702	784
Liabilities
Current operating lease liabilities	$ 685	746
Current operating lease liabilities, Statement of Financial Position	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Non-current operating lease liabilities	$ 1,679	1,783
Total operating lease liabilities	2,364	2,529
Current finance lease liabilities	$ 338	333
Current finance lease liabilities, Statement of Financial Position	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Non-current finance lease liabilities	$ 240	326
Non-current finance lease liabilities, Statement of Financial Position	us-gaap:OtherLiabilitiesNoncurrent
Total finance lease liabilities	$ 578	$ 659