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Income taxes (Details 2)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Israeli tax provision at statutory rate	25.00%	26.50%	26.50%
Foreign/state rate differences	(0.32%)	(0.22%)	0.00%
Non-deductible stock based compensation	(1.11%)	(4.53%)	(2.54%)
Previous years taxes	(0.47%)	0.00%	0.00%
Differences form which deferred taxes were not recorded	0.19%	0.20%	0.00%
Changes in valuation allowance	(18.39%)	(22.02%)	(5.35%)
Adjustment of deferred taxes due to tax rate changes	(5.89%)	0.00%	0.00%
Other permanent differences	(0.38%)	(0.09%)	(18.61%)
Effective Income Tax Rate Reconciliation, Percent	(1.37%)	(0.16%)	0.00%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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