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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