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INCOME TAXES - Schedule of Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Loss before income taxes	$ (27,990)	$ (39,864)	$ (82,357)
Combined federal and provincial rate	26.50%	26.50%	26.50%
Expected income tax recovery	$ (7,400)	$ (10,600)	$ (21,825)
Stock based compensation	934	704	291
Other non-deductible/non-taxable items	(1,303)	0	(2,984)
Foreign tax rate differences	0	(2,962)	(10,180)
Unrecognized deferred tax assets	7,769	12,858	34,698
Income tax expense	$ 0	$ 0	$ 0

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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

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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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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 foreign income tax expense (benefit).

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