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Income taxes (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Current: |  |  |
U.S. Federal | $ 0 | $ 0 | $ 0
U.S. State and Local | (2) | (2) | 4,890
Foreign | (766) | (483) | (197)
Deferred: |  |  |
U.S. Federal | 199 | 0 | 0
U.S. State and Local | 0 | 0 | 0
Foreign | 0 | 0 | 0
Total Tax (Expense) Benefit | $ (569) | $ (485) | $ 4,693

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