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Financial Instruments - Additional Information (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Cash and cash equivalents | $ 125,059,189 |  | $ 164,943,850 | $ 31,090,313
Accounts payable and accrued liabilities | $ 5,966,921 |  | $ 2,905,179 |
Convertible debentures, aggregate principal amount |  | $ 120,000,000 |  |
Borrowings, interest rate | 7.50% | 7.50% | 7.50% |
Amounts held in foreign risk [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Financial liabilities, net |  | $ 75,988,648 |  |
Percentage of reasonably possible change in currency rates | 10.00% |  |  |
Value at risk | $ 10,366,195 |  |  |

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