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INCOME TAXES - Schedule of Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ (39,864)	$ (82,357)	$ (86,532)
Combined federal and provincial rate	26.50%	26.50%	26.50%
Expected income tax recovery	$ (10,600)	$ (21,825)	$ (22,931)
Stock based compensation	704	291	337
Other non-deductible/non-taxable items	0	(2,984)	(743)
Foreign tax rate differences	(2,962)	(10,180)	(9,884)
Change in valuation allowance	12,858	34,698	33,324
Income tax expense	$ 0	$ 0	$ 103

X

- Definition

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

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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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 foreign income tax expense (benefit).

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