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Income taxes - Components of Loss Before Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Domestic	$ (9,702,869)	$ (6,526,706)	$ (5,950,862)
Foreign	(679,190)	(2,731,941)	(2,519,799)
Loss before income taxes	$ (10,382,059)	$ (9,258,647)	$ (8,470,661)

X

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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-SubTopic 10
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- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

+ References

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