Share capital - Narrative (Details)	3 Months Ended						6 Months Ended
	May 31, 2022 USD ($) $ / shares shares	Feb. 28, 2022 USD ($) shares	Feb. 28, 2022 $ / shares	May 31, 2021 USD ($) shares	Feb. 28, 2021 USD ($) $ / shares shares	Feb. 28, 2021 $ / shares	May 31, 2022 USD ($) $ / shares shares	May 31, 2021 USD ($)	May 31, 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 | $	$ (503,000)	$ (1,865,000)		$ (524,000)	$ (2,148,000)
Non-vested stock options outstanding	12,187,150						12,187,150
Weighted average exercise price options outstanding | $ / shares	$ 2.50						$ 2.50
Proceeds from exercise of options | $							$ 54,000	$ 106,000
Aggregate intrinsic value, vested options | $	$ 130,000			$ 6,800,000			130,000	6,800,000
Aggregate intrinsic value, options exercised | $							$ 50,000.00	710,000
Share capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock committed for issuance	145,871,247						145,871,247			145,009,811
Exercise of options, Number of shares	276,961	31,674		232,000	76,635		328,635
Nonvested Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options outstanding	2,312,838						2,312,838
Weighted average exercise price options outstanding | $ / shares									$ 2.43
Stock option expense not yet recognized | $	$ 570,000						$ 570,000
DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $							$ 1,200,000	70,000.00
Granted units							193,740
Outstanding grants	1,471,185						1,471,185			1,277,445
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted units							758,600
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							$ 0.85
Non-vested stock options outstanding	12,187,150						12,187,150			10,539,324
Weighted average exercise price options outstanding | $ / shares	$ 2.50						$ 2.50			$ 2.54
Exercise of options, Number of shares							81,674
Proceeds from exercise of options | $							$ 54,295
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	0	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					$ 0.84		$ 0.90
Directors, employees and service providers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $							$ 1,200,000	$ 2,600,000