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Commitments and contingencies - Future Minimum Capital Payments under Certain Data Licensing Agreements (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
Remainder of 2018 $ 1,444
2019 6,410
2020 6,400
2021 4,775
2022 1,302
Total $ 20,331