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Share capital - Stock options outstanding (Details)
12 Months Ended
Nov. 30, 2021
$ / shares
shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Number of outstanding options | shares 10,539,324
Weighted average years to expiry 3 years 1 month 13 days
Weighted average exercise price options outstanding $ 1.99
Number of exercisable options | shares 8,012,986
Weighted average exercise price exercisable $ 1.97
Number of unvested options | shares 2,526,338
$0.55 to $1.00  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price lower range limit $ 0.55
Exercise price upper range limit $ 1.00
Number of outstanding options | shares 876,674
Weighted average years to expiry 11 months 12 days
Weighted average exercise price options outstanding $ 0.78
Number of exercisable options | shares 876,674
Weighted average exercise price exercisable $ 0.78
$1.01 to $1.50  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price lower range limit 1.01
Exercise price upper range limit $ 1.50
Number of outstanding options | shares 75,000
Weighted average years to expiry 1 year 21 days
Weighted average exercise price options outstanding $ 1.15
Number of exercisable options | shares 75,000
Weighted average exercise price exercisable $ 1.15
$1.51 to $2.00  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price lower range limit 1.51
Exercise price upper range limit $ 2.00
Number of outstanding options | shares 4,265,150
Weighted average years to expiry 3 years 9 months 10 days
Weighted average exercise price options outstanding $ 1.95
Number of exercisable options | shares 2,775,483
Weighted average exercise price exercisable $ 1.93
Number of unvested options | shares 1,489,667
$2.01 to $2.50  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price lower range limit $ 2.01
Exercise price upper range limit $ 2.50
Number of outstanding options | shares 5,285,000
Weighted average years to expiry 2 years 11 months 23 days
Weighted average exercise price options outstanding $ 2.23
Number of exercisable options | shares 4,248,329
Weighted average exercise price exercisable $ 2.24
Number of unvested options | shares 1,036,671
$2.51 to $2.67  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price lower range limit $ 2.51
Exercise price upper range limit $ 2.67
Number of outstanding options | shares 37,500
Weighted average years to expiry 2 years 5 months 19 days
Weighted average exercise price options outstanding $ 2.67
Number of exercisable options | shares 37,500
Weighted average exercise price exercisable $ 2.67