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Lease commitments - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows provided by operating leases $ (472) $ (297)
Operating cash flows used for financing lease 11 24
Lease liabilities related to the acquisition of right-of-use assets:    
Operating leases 48 117
Cash reimbursements for tenant improvements $ 640 $ 640