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Commitments and contingencies - Lease, Operating Leases, Future Lease Payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2019 $ 3,216
2020 2,900
2021 2,409
2022 2,082
2023 and thereafter 3,321
Total future minimum lease payments $ 13,928