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Lease commitments - Schedule of Future Maturities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Operating Leases
Remainder of 2019	$ 1,092
2020	2,186
2021	2,136
2022	2,077
2023	2,222
Thereafter	4,109
Total undiscounted cash flows	13,822
Less: imputed interest	(1,991)
Present value of lease liabilities	11,831
Financing Lease
Remainder of 2019	76
2020	157
2021	157
2022	158
2023	169
Thereafter	312
Total undiscounted cash flows	1,029
Less: imputed interest	(154)
Present value of lease liabilities	$ 875

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