Share capital - Narrative (Details)	3 Months Ended
	Feb. 28, 2022 USD ($) $ / shares shares	Feb. 28, 2022 USD ($) $ / shares $ / shares shares	Feb. 28, 2021 USD ($) $ / shares shares	Feb. 28, 2021 USD ($) $ / shares	Feb. 28, 2022 $ / shares	Nov. 30, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, conversion	1
Stock-based compensation | $	$ (1,865,000)		$ (2,148,000)
Non-vested stock options outstanding	12,242,150	12,242,150
Weighted average exercise price options outstanding | $ / shares	$ 2.50	$ 2.50
Proceeds from exercise of options | $	$ 18,000
Aggregate intrinsic value, vested options | $	150,000	$ 150,000	3,300,000	$ 3,300,000
Aggregate intrinsic value, options exercised | $	$ 30,000.00		$ 170,000
Share capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock committed for issuance	145,464,286	145,464,286				145,009,811
Exercise of options, Number of shares	31,674		76,635
Nonvested Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options outstanding	2,317,838	2,317,838
Weighted average exercise price options outstanding | $ / shares					$ 2.43
Stock option expense not yet recognized | $	$ 830,000	$ 830,000
DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $	$ 1,000,000.0		$ 40,000.00
Granted units	160,740
Outstanding grants	1,438,185	1,438,185				1,277,445
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted units	648,600
Outstanding grants	257,268	257,268
Stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, weighted average exercise price | $ / shares	$ 0.70
Non-vested stock options outstanding	12,242,150	12,242,150				10,539,324
Weighted average exercise price options outstanding | $ / shares	$ 2.50	$ 2.50				$ 2.54
Exercise of options, Number of shares	31,674
Proceeds from exercise of options | $	$ 17,640
Stock options granted	1,734,500
Weighted-average exercise price | $ / shares	$ 2.21
Employees, consultants and directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, expiration period	5 years
Stock options granted	1,734,500		3,374,150
Vesting period			2 years
Weighted-average exercise price | $ / shares		$ 2.21		$ 2.52
Stock options granted, weighted average fair value | $ / shares	$ 0.90		$ 1.07
Directors, employees and service providers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $	$ 860,000		$ 2,100,000