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CAPITAL STOCK - Schedule of Stockholders' Equity Note, Warrants or Rights (Details) - 12 months ended Dec. 31, 2016 $ / shares in Units, $ in Thousands | USD ($) | CAD / shares shares | $ / shares shares
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Share Purchase Warrants Denominated in Canadian Dollars | June 22, 2017 Expiration date |  |  |
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 Expiration Date |  |  |
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 | $ | $ 3,912 |  |
Share Purchase Warrants Denominated in United States Dollars | January 25, 2017 Expiration Date |  |  |
Class of Warrant or Right [Line Items] |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  | $ 6.28
Number of warrants outstanding (in shares) |  | 1,224,000 | 1,224,000
Fair value of warrants | $ | 0 |  |
Share Purchase Warrants Denominated in United States Dollars | March 14, 2019 Expiration Date |  |  |
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 | $ | 807 |  |
Share Purchase Warrants Denominated in United States Dollars | September 20, 2021 Expiration Date |  |  |
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 | $ | $ 3,105 |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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