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Share Capital - Disclosure of Indirect Measurement of Fair Value of Goods or Services Received, Share Options Granted (Detail) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Weighted average assumptions for share options granted [Abstract]    
Exercise price (C$) $ 11.80 $ 5.30
Risk-free interest rate 0.40% 1.80%
Volatility 65.20% 65.70%
Dividend yield 0.00% 0.00%
Expected life 5 years 5 years