v3.20.2

Income taxes: (Details) - Provision for Income Taxes - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Provision for Income Taxes [Abstract]
Computed expected benefit of income taxes	$ (1,891,163)	$ (865,648)	$ (966,289)
Stock-based compensation	1,286,201	332,082	68,037
Non-deductible interest expense	25,722	25,658	52,648
Impact of change in tax rate		5,163,267	0
Expiry of tax credits	18,486
True up of prior year balances	37,917
Increase (decrease) in valuation allowance	522,837	(4,655,359)	845,604
Income tax provision			$ 0

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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 income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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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 income tax rates.

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