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Financial Instruments - Summary of Company's Foreign Currency Balances Subject to Exchange Risk (Details) $ in Thousands | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CAD ($) | Feb. 28, 2018 CAD ($)
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Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 60,376,000 |  | $ 45,337,000 |  | $ 14,121,000 | $ 7,678,000
Foreign Currency Risk | USD |  |  |  |  |  |
Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  | $ 1 |  | $ 22,088 |  |
Accounts payable and accrued liabilities |  | (206) |  | (2,150) |  |
Net foreign exchange exposure | $ (261,000) | (205) | $ 25,895,000 | 19,938 |  |
Translation to CAD | 1.2732 |  | 1.2988 |  |  |
CAD equivalent at period end exchange rate | $ (261,000) | $ (205) | $ 25,895,000 | $ 19,938 |  |

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