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Other balance sheet items - Schedule of Amortization Expense Relating to Intangible Assets with Finite Lives (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
2018 $ 678
2019 268
2020 138
2021 6
2022 3
Thereafter 13
Total $ 1,106