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Income taxes - Provision for Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |
U.S. Federal | $ 0 | $ 0 | $ 0
U.S. State and Local | (6) | (2) | (2)
Foreign | (1,131) | (766) | (483)
Deferred: |  |  |
U.S. Federal | (198) | 199 | 0
U.S. State and Local | 0 | 0 | 0
Foreign | 0 | 0 | 0
Total tax expense | $ (1,335) | $ (569) | $ (485)

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