INCOME TAXES - Expected tax expense (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Relationship between expected tax expense and provincial income tax rate
Loss before income taxes	$ (107,935,775)	$ (22,424,293)	$ (86,294,370)
Statutory tax rate	27.00%	26.00%	26.00%
Recovery of income taxes based on the combined Canadian federal and provincial statutory rates	$ (29,142,659)	$ (5,830,316)	$ (22,436,536)
Share-based remuneration	1,073,142	650,335	468,939
Effect of rate change		(2,344,122)
Foreign exchange adjustment		(28,668)	333,276
Other permanent differences	20,930,238	(1,798,205)	(8,821,908)
Unrecognized deferred tax benefits	7,183,316	9,670,642	30,531,995
Difference in tax rates between foreign jurisdictions and Canada	63,056	164,762	124,757
Income tax expense	107,093	484,428	200,523
Components of income tax expense
Current tax	$ 107,093	$ 484,428	$ 200,523

The tax expense (income) divided by the accounting profit. [Refer: Accounting profit]

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The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

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The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that the entity does not separately disclose in the same statement or note. [Refer: Accounting profit; Applicable tax rate]

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The profit (loss) before tax expense or income. [Refer: Profit (loss)]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to foreign tax rates. [Refer: Accounting profit]

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The product of the accounting profit multiplied by the applicable tax rate(s). [Refer: Accounting profit; Applicable tax rate]

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to adjustment to foreign currency.

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to remuneration of share based.

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to unrecognized deferred tax benefits.

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