Share capital - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Feb. 28, 2023 USD ($) $ / shares shares	Feb. 28, 2023 USD ($) $ / shares $ / shares shares	Feb. 28, 2022 USD ($) $ / shares shares	Feb. 28, 2022 USD ($) $ / shares	Feb. 28, 2023 $ / shares	Nov. 30, 2022 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, conversion	1
Stock-based compensation | $	$ (2,220)		$ (1,865)
Non-vested stock options outstanding	13,585,400	13,585,400
Weighted average exercise price options outstanding | $ / shares	$ 2.18	$ 2.18
Period for recognition of stock compensation expense	22 months
Proceeds from exercise of options | $			18
Aggregate intrinsic value, vested options | $	$ 20	$ 20	150	$ 150
Aggregate intrinsic value, options exercised | $			$ 30
Share capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock committed for issuance	148,722,699	148,722,699				146,225,035
Exercise of options, Number of shares			31,674
Nonvested Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options outstanding	2,148,424	2,148,424
Weighted average exercise price options outstanding | $ / shares					$ 1.03
Stock option expense not yet recognized | $	$ 470	$ 470
DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $	$ 1,100		$ 1,000
Granted units	760,519
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted units	3,699,297
Stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options outstanding	13,585,400	13,585,400				11,225,400
Weighted average exercise price options outstanding | $ / shares	$ 2.18	$ 2.18				$ 2.49
Exercise of options, Number of shares	0
Stock options granted	3,230,000
Weighted-average exercise price | $ / shares	$ 0.78
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	3,230,000		1,734,500
Vesting period	2 years
Weighted-average exercise price | $ / shares		$ 0.78		$ 2.21
Stock options granted, weighted average fair value | $ / shares	$ 0.37		$ 0.90
Directors, employees and service providers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $	$ 500		$ 860
Directors, employees and service providers | NovaGold Arrangement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, conversion	6
Directors, employees and service providers | NovaGold Arrangement | Nonvested Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock committed for issuance	1,549	1,549
Non-vested stock options outstanding	9,293	9,293