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Income taxes (Details 1)	12 Months Ended
	Dec. 31, 2016
U.S. statutory federal rate	34.00%
State taxes, net of federal effect	(2.00%)
Foreign tax rate differential	(128.30%)
Permanent items	20.90%
Valuation allowance for deferred tax assets	51.40%
Effective Income Tax Rate Reconciliation, Percent	(23.90%)

X

- Definition

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 Permanent items.

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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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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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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