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Income Taxes (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Tax provision summary |  |
State income tax | $ 21 | $ 18
Deferred tax benefit, release of valuation allowance |  | (635)
Deferred tax benefit - federal | 2,382 | (1,101)
Deferred tax benefit - state | (149) | (89)
Deferred tax benefit - foreign | (75) | (453)
Change in valuation allowance | (2,218) | 1,895
Tax (benefit)/expense | $ (39) | $ (365)

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