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Long-term debt - Purchase warrants issued to CIBC (Details)
$ in Thousands
12 Months Ended
Jul. 31, 2018
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Variables used to determine the fair value of warrants      
Share price | $ / shares   $ 14.26 $ 26.19
Volatility   61.00% 63.00%
Expected life of warrants   1 year 7 months 6 days 2 years 7 months 6 days
Risk free interest rate   0.94% 0.20%
CIBC loan      
Disclosure of detailed information about borrowings [line items]      
Number of warrants issued | shares 32,171    
Number of common share that each warrant entitles the holder | shares 1    
Purchase warrant price per common share | $ / shares $ 9.70    
Term of the warrant 60 months    
Fair value of warrants | $   $ 161 $ 450