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Lease commitments - Supplemental Cash Flow Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities:  
Operating cash flows used for operating leases $ 399
Operating cash flows used for financing lease 13
Lease liabilities related to the acquisition of right-of-use assets:  
Operating lease $ 69