Share capital - Common shares issued and outstanding (Details) - Share capital [Member] - USD ($) $ in Thousands |
6 Months Ended | 12 Months Ended |
|---|---|---|
May 31, 2020 |
Nov. 30, 2019 |
|
| Number of shares | 140,427,761 | 131,585,612 |
| Ascribed value | $ 177,971 | $ 164,069 |
| Exercise of options (shares) | 82,624 | 1,725,776 |
| Exercise of options | $ 38 | $ 1,123 |
| Restricted share units (Shares) | 412,501 | 412,501 |
| Restricted share units | $ 642 | $ 424 |
| Deferred share units (Shares) | 182,132 | |
| Deferred share units | 189,000 | |
| Exercise of warrants | $ 12,166 | |
| Exercise of warrants (Shares) | 6,521,740 | |
| Number of shares | 140,922,886 | 140,427,761 |
| Ascribed value | $ 178,651 | $ 177,971 |