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INCOME TAXES - Schedule of Capital Losses and Net Operating Losses (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Operating Loss Carryforwards [Line Items]
Net operating losses expected to expire	$ 75,000
CANADA | Non-capital losses | Canada
Operating Loss Carryforwards [Line Items]
Amount	40,085
CANADA | Capital losses | Canada
Operating Loss Carryforwards [Line Items]
Amount	3,215
CANADA | Investment tax credits | Canada
Operating Loss Carryforwards [Line Items]
Amount	1,185
Pre-2018 net operating losses | UNITED STATES | United States
Operating Loss Carryforwards [Line Items]
Amount	268,395
Post-2017 net operating losses | UNITED STATES | United States
Operating Loss Carryforwards [Line Items]
Amount	$ 24,186

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

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