Share capital - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended									9 Months Ended
	Nov. 30, 2024 USD ($)	Aug. 31, 2024 USD ($) $ / shares shares	May 31, 2024 USD ($) shares	Feb. 29, 2024 USD ($) shares	Feb. 29, 2024 $ / shares	Aug. 31, 2023 USD ($)	May 31, 2023 USD ($) shares	Feb. 28, 2023 USD ($) shares	Feb. 28, 2023 $ / shares	Aug. 31, 2024 USD ($) $ / shares shares	Aug. 31, 2024 USD ($) $ / shares $ / shares shares	Aug. 31, 2023 USD ($)	Aug. 31, 2024 $ / shares	Nov. 30, 2023 $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares, conversion										1
Non-vested stock options outstanding		14,316,900								14,316,900	14,316,900
Private placement, net proceeds | $												$ 3,115
Stock-based compensation | $		$ (509)	$ (509)	$ (1,999)		$ (393)	$ (371)	$ (2,220)
Weighted average exercise price options outstanding | $ / shares		$ 1.78								$ 1.78	$ 1.78
Forecast [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock option expense recognized | $	$ 100
Common Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock committed for issuance		160,567,514								160,567,514	160,567,514			155,925,990
Shares issued for private placement, net of share issue cost (Shares)							5,854,545
Nonvested Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Non-vested stock options outstanding		2,533,339								2,533,339	2,533,339
Weighted average exercise price options outstanding | $ / shares													$ 0.66
Stock option expense not yet recognized | $		$ 200								$ 200	$ 200
RSU and DSU
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation | $		$ 200				200
DSUs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation | $										$ 1,800		2,000
Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Non-vested stock options outstanding		14,316,900								14,316,900	14,316,900			12,649,400
Weighted average exercise price options outstanding | $ / shares		$ 1.78								$ 1.78	$ 1.78			$ 2.15
Exercise of options, Number of shares										0
Stock options granted										2,775,000
Weighted-average exercise price | $ / shares										$ 0.59
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	2,775,000				3,230,000
Vesting period				2 years				2 years
Weighted-average exercise price | $ / shares					$ 0.59				$ 0.78
Stock options granted, weighted average fair value | $ / shares					$ 0.27				$ 0.37		$ 0.27
Directors, employees and service providers | Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation | $		$ 100				$ 100				$ 500		$ 800