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Convertible Debentures - Summary of Detailed Information about Convertible Debentures Fair Value and Interest Components (Detail) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Jul. 21, 2017 CAD ($) | Jul. 21, 2017 USD ($) | Dec. 31, 2016 CAD ($) | Jun. 10, 2016 CAD ($) | Jun. 10, 2016 USD ($)
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2016 Debentures [member] |  |  |  |  |  |  |  |  |
Convertible debentures [line items] |  |  |  |  |  |  |  |  |
Fair value adjustment during the period | $ (18,260,998) |  | $ 19,930,572 |  |  |  |  |  |
Interest payable | 354,480 |  | 350,900 |  |  |  |  |  |
Convertible debentures and interest payable | 72,835,855 |  | 91,093,273 |  |  |  |  |  |
Less: interest payable included in accounts payable & accrued liabilities | (354,480) |  | (350,900) |  |  |  |  |  |
Convertible debentures at fair value | 72,481,375 | $ 53,131,047 | 90,742,373 | $ 72,333,498 |  |  | $ 70,811,801 | $ 74,123,520 | $ 58,200,000
2017 Debentures [member] |  |  |  |  |  |  |  |  |
Convertible debentures [line items] |  |  |  |  |  |  |  |  |
Fair value adjustment during the period | (14,918,084) |  | 7,592,413 |  |  |  |  |  |
Interest payable | 354,480 |  | 350,900 |  |  |  |  |  |
Convertible debentures and interest payable | 66,063,989 |  | 80,978,493 |  |  |  |  |  |
Less: interest payable included in accounts payable & accrued liabilities | (354,480) |  | (350,900) |  |  |  |  |  |
Convertible debentures at fair value | $ 65,709,509 | $ 48,167,064 | $ 80,627,593 | $ 64,270,700 | $ 73,035,180 | $ 58,200,000 | $ 73,035,180 |  |

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