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Commitments and contingencies - Schedule of Future Minimum Lease Payments under Operating Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 5,375
2020 5,210
2021 3,876
2022 2,832
2023 2,858
Thereafter 7,167
Total $ 27,318