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Share Capital - Summary of Stock Option Transactions and the Number of Stock Options (Detail)
12 Months Ended
Dec. 31, 2021
$ / shares
Dec. 31, 2020
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [abstract]    
Number of Stock Options Outstanding, Beginning Balance 36,473,162 36,617,495
Number of Stock Options, Granted 17,400,000 9,555,000
Number of Stock Options, Exercised (10,020,001) (7,490,999)
Number of Stock Options, Expired (266,666) (2,208,334)
Number of Stock Options, Forfeited (150,001)  
Number of Stock Options Outstanding, Ending Balance 43,436,494 36,473,162
Number of Stock Options Outstanding, Number of options exercisable 28,868,138  
Weighted Average Exercise Price Outstanding, Beginning Balance $ 2.47 $ 2.14
Weighted Average Exercise Price, Granted 5.61 2.54
Weighted Average Exercise Price, Exercised 2.59 0.90
Weighted Average Exercise Price, Expired 2.18 2.75
Weighted Average Exercise Price, Forfeited 5.84  
Weighted Average Exercise Price Outstanding, Ending Balance 3.69 $ 2.47
Weighted Average Exercise Price Outstanding, Number of options exercisable $ 3.05