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Share-based payment arrangements - Summary of Assumptions Used to Estimate the Fair Value of Options Granted (Details)
 12 Months Ended
Dec. 31, 2019
CAD ($)
yr
Dec. 31, 2018
CAD ($)
yr
Disclosure of range of exercise prices of outstanding share options [line items]    
Expected dividends (in Cdn$) | $ $ 0.00 $ 0.00
Bottom of range    
Disclosure of range of exercise prices of outstanding share options [line items]    
Risk-free interest rate, range (in years) 1.34% 1.80%
Expected volatility, range (in years) 59.00% 58.00%
Expected life, range (in years) 1.98 1.79
Top of range    
Disclosure of range of exercise prices of outstanding share options [line items]    
Risk-free interest rate, range (in years) 1.80% 2.20%
Expected volatility, range (in years) 63.00% 64.00%
Expected life, range (in years) 3.98 3.79