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Income Taxes - Summary of Reconciliation of Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Loss before income taxes $ (54,742) $ (27,021)
Income tax at statutory rate 26.50% 26.50%
Computed income tax recovery $ (14,507) $ (7,160)
Federal investment tax credit (2,347) (985)
Accounting charges not deductible for tax purposes 346 277
Other (306) (16)
Change in valuation allowance 15,489 8,079
Tax (benefit) expense $ (1,325) $ 195