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CAPITAL STOCK - Schedule of Stockholders' Equity Note, Warrants or Rights (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2016
Class of Warrant or Right [Line Items] |  |  |
Fair value of warrants | $ 610 |  | $ 100
Share Purchase Warrants Denominated in United States Dollars |  |  |
Class of Warrant or Right [Line Items] |  |  |
Fair value of warrants |  | $ 7,396 |
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) | $ 3.20 | $ 3.20 |
Number of warrants outstanding (in shares) | 2,405,625 | 2,405,625 |
Fair value of warrants |  | $ 1,280 |
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) | $ 2.45 | $ 2.45 |
Number of warrants outstanding (in shares) | 4,167,480 | 4,167,480 |
Fair value of warrants |  | $ 6,116 |

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