INCOME TAXES - Expected tax expense (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Relationship between expected tax expense and provincial income tax rate
Loss before income taxes	$ (22,424,293)	$ (86,294,370)	$ (26,563,139)
Statutory tax rate	26.00%	26.00%	26.00%
Recovery of income taxes based on the combined Canadian federal and provincial statutory rates	$ (5,830,316)	$ (22,436,536)	$ (6,906,416)
Share-based remuneration	650,335	468,939	1,061,468
Effect of rate change	(2,344,122)
Foreign exchange adjustment	(28,668)	333,276	126,654
Other permanent differences	(1,798,205)	(8,821,908)	(2,352,402)
Unrecognized deferred tax benefits	9,670,642	30,531,995	8,191,467
Difference in tax rates between foreign jurisdictions and Canada	164,762	124,757	46,580
Income tax expense	484,428	200,523	167,351
Components of income tax expense
Current tax	$ 484,428	$ 200,523	$ 167,351

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 that relate to continuing operations. [Refer: Continuing operations [member]; 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) from continuing operations 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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