Share capital - Stock options outstanding (Details)	9 Months Ended
	Aug. 31, 2024 $ / shares shares
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of outstanding options | shares	14,316,900
Weighted average years to expiry	2 years 2 months 4 days
Weighted average exercise price options outstanding	$ 1.78
Number of exercisable options | shares	11,783,561
Weighted average exercise price exercisable	$ 2.03
Number of unvested options | shares	2,533,339
$0.59 to $1.00
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price lower range limit	$ 0.59
Exercise price upper range limit	$ 1.00
Number of outstanding options | shares	5,955,000
Weighted average years to expiry	3 years 8 months 23 days
Weighted average exercise price options outstanding	$ 0.69
Number of exercisable options | shares	3,421,661
Weighted average exercise price exercisable	$ 0.72
Number of unvested options | shares	2,533,339
$2.01 to $3.00
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price lower range limit	$ 2.01
Exercise price upper range limit	$ 3.00
Number of outstanding options | shares	7,016,900
Weighted average years to expiry	1 year 2 months 15 days
Weighted average exercise price options outstanding	$ 2.47
Number of exercisable options | shares	7,016,900
Weighted average exercise price exercisable	$ 2.47
Number of unvested options | shares	0
$3.01 to $3.41
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price lower range limit	$ 3.01
Exercise price upper range limit	$ 3.02
Number of outstanding options | shares	1,345,000
Weighted average years to expiry	3 months 25 days
Weighted average exercise price options outstanding	$ 3.02
Number of exercisable options | shares	1,345,000
Weighted average exercise price exercisable	$ 3.02
Number of unvested options | shares	0