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Lease commitments - Schedule of Future Maturities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Leases
Remainder of 2019	$ 594
2020	2,160
2021	2,131
2022	2,082
2023	2,222
Thereafter	4,116
Total undiscounted cash flows	13,305
Less: imputed interest	(2,134)
Present value of lease liabilities	11,171
Financing Lease
Remainder of 2019	88
2020	157
2021	157
2022	158
2023	169
Thereafter	312
Total undiscounted cash flows	1,041
Less: imputed interest	(160)
Present value of lease liabilities	$ 881

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