CAPITAL STOCK - Schedule of Stockholders' Equity Note, Warrants or Rights (Details) - 3 months ended Mar. 31, 2017 $ / shares in Units, $ in Thousands	USD ($)	CAD / shares shares	$ / shares shares
Share Purchase Warrants Denominated in Canadian Dollars | June 22, 2017
Class of Warrant or Right [Line Items]
Exercise price of warrants (in dollars per share) | CAD / shares		CAD 13.25
Number of warrants outstanding (in shares)		351,025,000	351,025,000
Share Purchase Warrants Denominated in Canadian Dollars | June 15, 2017
Class of Warrant or Right [Line Items]
Exercise price of warrants (in dollars per share) | CAD / shares		CAD 9.50
Number of warrants outstanding (in shares)		456,948,000	456,948,000
Share Purchase Warrants Denominated in United States Dollars
Class of Warrant or Right [Line Items]
Fair value of warrants | $	$ 6,122
Share Purchase Warrants Denominated in United States Dollars | March 14, 2019
Class of Warrant or Right [Line Items]
Exercise price of warrants (in dollars per share) | $ / shares			$ 3.20
Number of warrants outstanding (in shares)		2,515,625	2,515,625
Fair value of warrants | $	1,460
Share Purchase Warrants Denominated in United States Dollars | September 20, 2021
Class of Warrant or Right [Line Items]
Exercise price of warrants (in dollars per share) | $ / shares			$ 2.45
Number of warrants outstanding (in shares)		4,168,750	4,168,750
Fair value of warrants | $	$ 4,663