Share capital - Narrative (Details)	3 Months Ended						6 Months Ended	9 Months Ended
	Aug. 31, 2022 USD ($) $ / shares shares	May 31, 2022 USD ($) shares	Feb. 28, 2022 USD ($) shares	Aug. 31, 2021 USD ($) shares	May 31, 2021 USD ($) shares	Feb. 28, 2021 USD ($) shares	May 31, 2022 USD ($) shares	Aug. 31, 2022 USD ($) $ / shares shares	Aug. 31, 2022 USD ($) $ / shares $ / shares shares	Aug. 31, 2021 USD ($) $ / shares shares	Aug. 31, 2021 USD ($) $ / shares	Aug. 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 | $	$ (571,000)	$ (503,000)	$ (1,865,000)	$ (409,000)	$ (524,000)	$ (2,148,000)
Non-vested stock options outstanding	12,187,150							12,187,150	12,187,150
Weighted average exercise price options outstanding | $ / shares	$ 2.50							$ 2.50	$ 2.50
Proceeds from exercise of options | $								$ 54,000		$ 109,000
Aggregate intrinsic value, vested options | $				$ 2,200,000						2,200,000	$ 2,200,000
Aggregate intrinsic value, options exercised | $								$ 50,000.00		630,000
Share capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock committed for issuance	145,868,502							145,868,502	145,868,502				145,009,811
Exercise of options, Number of shares		50,000	31,674	5,000	232,000	76,635		81,674
Nonvested Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options outstanding	1,779,504							1,779,504	1,779,504
Weighted average exercise price options outstanding | $ / shares												$ 2.37
Stock option expense not yet recognized | $	$ 370,000							$ 370,000	$ 370,000
DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $								$ 1,600,000		$ 100,000
Granted units								230,203
Outstanding grants	1,507,648							1,507,648	1,507,648				1,277,445
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted units								1,002,816
Outstanding grants	257,268							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	12,187,150				10,539,324
Weighted average exercise price options outstanding | $ / shares	$ 2.50							$ 2.50	$ 2.50				$ 2.54
Exercise of options, Number of shares	0						81,674	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		5 years
Stock options granted	0	0						1,734,500		3,374,150
Vesting period								2 years		2 years
Weighted-average exercise price | $ / shares									$ 2.21		$ 2.52
Stock options granted, weighted average fair value | $ / shares								$ 0.94		$ 0.84
Directors, employees and service providers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $								$ 1,400,000		$ 2,980,000