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Income taxes (Details 3) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Operating loss roll forward | $ 5,685 | $ 3,580
Reserves and allowances | 1,956 | 2,185
Net deferred tax asset before valuation allowance | 7,641 | 5,765
Valuation allowance | (7,636) | (5,765)
Net deferred tax asset | $ 5 | $ 0

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