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Share capital - Narrative (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2012 shares | Nov. 30, 2021 USD ($) $ / shares shares | Nov. 30, 2021 USD ($) $ / shares $ / shares shares | Nov. 30, 2020 USD ($) $ / shares shares | Nov. 30, 2020 USD ($) $ / shares shares | Nov. 30, 2019 USD ($) $ / shares shares | Nov. 30, 2019 USD ($) $ / shares shares | Nov. 30, 2021 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation | $ |  | $ (3,472,000) |  | $ (3,564,000) |  | $ (3,845,000) |  |
Non-vested stock options outstanding |  | 10,539,324 | 10,539,324 |  |  |  |  |
Weighted average exercise price options outstanding | $ / shares |  |  |  |  |  |  |  | $ 1.99
Stock option expense not yet recognized | $ |  | $ 500,000 | $ 500,000 |  |  |  |  |
Period for recognition of stock compensation expense |  | 2 years |  |  |  |  |  |
Aggregate intrinsic value, vested options | $ |  | $ 800,000 | 800,000 | 2,400,000 | $ 2,400,000 | 7,200,000 | $ 7,200,000 |
Aggregate intrinsic value, options exercised | $ |  | $ 1,400,000 |  | $ 2,600,000 |  | 2,600,000 |  |
Rolling maximum number, percentage of the issued and outstanding Common Shares |  | 10.00% |  |  |  |  |  |
Warrants outstanding | $ |  | $ 0 | $ 0 |  |  |  |  |
Exercise of warrants | $ |  |  |  |  |  | $ 9,900,000 |  |
Exercise of warrants (Shares) |  |  |  |  |  | 6,521,740 |  |
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 |  | 145,009,811 | 145,009,811 | 144,137,850 | 144,137,850 | 140,427,761 | 140,427,761 |
Exercise of warrants (Shares) |  |  |  |  |  | 6,521,740 |  |
Nonvested Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Non-vested stock options outstanding |  | 2,526,338 | 2,526,338 |  |  |  |  |
Weighted average exercise price options outstanding | $ / shares |  | $ 2.06 | $ 2.06 |  |  |  |  |
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 |  | 11,927 | 11,927 |  |  |  |  |
Granted units |  | 58,925 |  | 83,775 |  | 137,514 |  |
Outstanding grants |  | 1,277,445 | 1,277,445 | 1,218,520 | 1,218,520 |  |  |
Annual retainer percentage in DSUs |  | 50.00% |  |  |  |  |  |
RSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted units |  | 0 |  |  |  |  |  |
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 |  | 1,988 | 1,988 |  |  |  |  |
Stock Compensation Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation | $ |  | $ 100,000 |  | $ 500,000 |  | $ 900,000 |  |
Stock Option. |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation | $ |  | $ 3,300,000 |  | $ 3,100,000 |  | $ 2,900,000 |  |
Closing foreign exchange rate |  | 0.7817 | 0.7817 |  |  |  |  |
Employees, consultants and directors |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock options granted |  | 3,374,150 |  | 4,445,000 |  | 3,077,500 |  |
Weighted-average exercise price | $ / shares |  |  | $ 2.52 |  | $ 2.79 |  | $ 2.86 |
Stock options granted, weighted average fair value | $ / shares |  | $ 0.84 |  | $ 0.90 |  | $ 1.03 |  |
Employees, consultants and directors | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period |  | 5 years |  |  |  |  |  |
Employees, consultants and directors | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period |  | 2 years |  |  |  |  |  |

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