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Income Taxes - Summary of Deferred Tax (Assets) and Liabilities (Detail) - CAD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax liabilities | $ 199,000 | $ 280,000 | $ 137,000
Exploration and evaluation assets [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax liabilities | 5,998,000 | 4,333,000 |
Convertible debentures [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax liabilities | 4,041,000 |  |
Non-capital losses [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax liabilities | 9,639,000 | 3,916,000 |
Share issuance costs [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax liabilities | 177,000 | 119,000 |
Equipment [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax liabilities | $ 24,000 | $ 18,000 |

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