Share capital - Narrative (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Apr. 25, 2023 USD ($) $ / shares shares	Apr. 30, 2012 shares	Nov. 30, 2023 USD ($) $ / shares shares	Nov. 30, 2023 USD ($) $ / shares shares	Nov. 30, 2022 USD ($) $ / shares shares	Nov. 30, 2022 $ / shares shares	Nov. 30, 2021 USD ($) $ / shares shares	Nov. 30, 2021 USD ($) $ / shares	Nov. 30, 2023 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options outstanding			12,649,400	12,649,400
Private placement, net proceeds | $			$ 3,115
Stock-based compensation | $			(3,753)		$ (3,427)		$ (3,472)
Weighted average exercise price options outstanding | $ / shares									$ 2.15
Stock option expense not yet recognized | $			$ 200	$ 200
Period for recognition of stock compensation expense			12 months
Aggregate intrinsic value, vested options | $							800	$ 800
Aggregate intrinsic value, options exercised | $					$ 40		$ 1,400
Rolling maximum number, percentage of the issued and outstanding Common Shares			10.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			5 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Rolling maximum number, percentage of the issued and outstanding Common Shares			10.00%
Share capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock committed for issuance			155,925,990	155,925,990		146,225,035
Shares issued for private placement, net of share issue cost (Shares)			5,854,545
Exercise of options, Number of shares					81,674		871,961
Non-brokered private placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares issued	5,854,545
Price per common share | $ / shares	$ 0.55
Private placement, gross proceeds | $	$ 3,200
Private placement, net proceeds | $	$ 3,100
Nonvested Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options outstanding			2,131,757	2,131,757
Weighted average exercise price options outstanding | $ / shares									1.02
Restricted Share Units and Deferred Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, conversion			1
DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock committed for issuance			5,144	5,144
Annual retainer percentage in DSUs			100.00%
NovaGold Arrangement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, conversion		6
Common stock, terms of conversion		On April 30, 2012, under the NovaGold Arrangement, Trilogy committed to issue common shares to satisfy holders of NovaGold deferred share units (“NovaGold DSUs”), once vested, on record as of the close of business April 27, 2012. When vested, Trilogy committed to deliver one common share to the holder for every six shares of NovaGold the holder is entitled to receive, rounded down to the nearest whole number.
Common Stock, Other Shares, Outstanding			859	859
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options outstanding			12,649,400	12,649,400		11,225,400
Weighted average exercise price options outstanding | $ / shares						$ 2.49			$ 2.15
Exercise of options, Number of shares			0
Stock options granted			3,230,000
Weighted-average exercise price | $ / shares				$ 0.78
Stock Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $			$ 3,000		$ 2,000		$ 100
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $			$ 900		$ 1,400		$ 3,300
Employees, consultants and directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted			3,230,000		1,734,500		3,374,150
Weighted-average exercise price | $ / shares				$ 0.78		$ 2.21		$ 2.52
Stock options granted, weighted average fair value | $ / shares			$ 0.27		$ 0.71		$ 0.84
Employees, consultants and directors | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, expiration period			5 years
Employees, consultants and directors | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			2 years