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LOANS AND BORROWINGS - (Outstanding Loans) (Details) $ in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 03, 2013
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Nominal interest rate |  |  |  |  | 5.75%
Face value | $ 15,298 |  | $ 27,491 |  |
Carrying amount | $ 15,880 |  | 27,491 |  |
Convertible Debt | Convertible Debentures |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Nominal interest rate | 8.50% | 8.50% |  |  |
Face value |  | $ 15,298 |  | $ 16,636 |
Carrying amount |  | $ 15,880 |  | $ 16,636 |
Secured Debt | Wyoming Industrial Development Revenue Bond Program Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Nominal interest rate | 5.75% | 5.75% |  |  |
Face value | $ 0 |  | 10,855 |  |
Carrying amount | $ 0 |  | $ 10,855 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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