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Derivative Warrant Liabilities - Series A and Series B Warrants - Additional Information (Details) $ / shares in Units, $ in Millions |  |  |  | 2 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 20, 2020 shares | Aug. 19, 2020 shares | Aug. 18, 2020 $ / shares shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2020 CAD ($) shares $ / shares | Dec. 31, 2020 shares $ / shares
Disclosure Of Detailed Information About Derivative Warrant Liability [Line Items] |  |  |  |  |  |
Warrants term |  |  |  |  |  | 5 years
Issuance of common shares |  |  |  | 296,700,000 |  |
Warrants outstanding |  |  |  | 2,080,000 | 2,080,000 | 2,080,000
Series A Warrants |  |  |  |  |  |
Disclosure Of Detailed Information About Derivative Warrant Liability [Line Items] |  |  |  |  |  |
Number of warrants issued |  |  | 40,100,000 |  |  |
Warrants exercise price | $ / shares |  |  | $ 0.75 | $ 0.1766 | $ 0.1766 | $ 0.1766
Warrants exercised |  |  |  |  | 39,600,000 |
Weighted average exercise price of warrants | $ / shares |  |  |  |  | $ 0.1766 |
Issuance of common shares |  |  |  |  | 39,600,000 |
Gross proceeds from exercise of warrants | $ |  |  |  |  | $ 9.1 |
Warrants outstanding |  |  |  | 500,000 | 500,000 | 500,000
Series B Warrants |  |  |  |  |  |
Disclosure Of Detailed Information About Derivative Warrant Liability [Line Items] |  |  |  |  |  |
Number of warrants issued |  |  | 14,300,000 |  |  |
Warrants exercise price | $ / shares |  |  | $ 0.0001 |  |  |
Warrants exercised | 5,100,000 | 9,200,000 |  |  |  |
Series A and Series B Warrants |  |  |  |  |  |
Disclosure Of Detailed Information About Derivative Warrant Liability [Line Items] |  |  |  |  |  |
Warrants term |  |  | 5 years |  |  |

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