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Income Taxes - Summary of Reconciliation of Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Loss before income taxes $ (108,586) $ (54,742) $ (27,021)
Income tax at statutory rate 26.50% 26.50% 26.50%
Computed income tax recovery $ (28,775) $ (14,507) $ (7,160)
Federal investment tax credit (4,093) (2,347) (985)
Accounting charges not deductible for tax purposes 1,078 1,088 143
Equity compensation 2,220 (742) 134
Other 644 (306) (16)
Change in valuation allowance 27,248 15,489 8,079
Tax (benefit) expense $ (1,678) $ (1,325) $ 195