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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, 2019
Dec. 31, 2018
Weighted average assumptions for share options granted [Abstract]    
Exercise price (C$) $ 5.30 $ 5.45
Risk-free interest rate 1.80% 2.10%
Volatility 65.70% 68.60%
Dividend yield 0.00% 0.00%
Expected life 5 years 4 years 9 months 18 days