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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Tax Credit Carryforward [Line Items] |  |
Recovery of (provision for) income taxes | $ (79,145) | $ 29,027
Non-capital tax losses | 342,308 | 209,759
Non-capital tax losses, no expiration | 273,131 |
Non-capital tax losses, expire between 2033 and 2039 | 69,177 |
Investment Tax Credit Carryforward |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforwards | $ 14,629 | $ 2,111

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