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Income taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax benefit	$ (2,180,233)	$ (3,147,940)	$ (2,880,025)
State and provincial income tax, net of federal benefit	(534,789)	(678,438)	(604,354)
Permanent differences	53,795	(2,923)	234,247
US-Foreign rate differential	(13,955)	371,551	359,729
Other, net	1,182,900	(98,947)	73,220
Effect of tax reform	0	3,687,844	0
Income tax expense, before valuation allowance	(1,492,282)	131,147	(2,817,183)
Change in valuation allowance	1,492,282	(131,147)	2,817,183
Total income tax	$ 0	$ 0	$ 0

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Income Tax Expense (Benefit), Before Valuation Allowance

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

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Amount 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 increase (decrease) in the valuation allowance for deferred tax assets.

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