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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

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Weighted average years to expiry

+ References

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
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