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FINANCIAL RISK MANAGEMENT - Disclosure of changes in assets and liabilities on basis of strengthening CAD against USD (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Cash and cash equivalent [Member] |  |
Disclosure Foreign Currency Sensitivity Analysis [Line Items] |  |
Change in financial assets and liabilities due to exchange rate | $ (6,213) | $ (2,803)
Accounts receivable [Member] |  |
Disclosure Foreign Currency Sensitivity Analysis [Line Items] |  |
Change in financial assets and liabilities due to exchange rate | (412) | (824)
Accounts payable and accrued liabilities [Member] |  |
Disclosure Foreign Currency Sensitivity Analysis [Line Items] |  |
Change in financial assets and liabilities due to exchange rate | 563 | 587
Senior secured notes [Member] |  |
Disclosure Foreign Currency Sensitivity Analysis [Line Items] |  |
Change in financial assets and liabilities due to exchange rate | 23,321 | 23,790
Equipment loans [Member] |  |
Disclosure Foreign Currency Sensitivity Analysis [Line Items] |  |
Change in financial assets and liabilities due to exchange rate | 414 | 527
Lease liabilities [Member] |  |
Disclosure Foreign Currency Sensitivity Analysis [Line Items] |  |
Change in financial assets and liabilities due to exchange rate | $ 40 | $ 62

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