Share capital - Common shares issued and outstanding (Details) - Share capital - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2020	Nov. 30, 2019
Beginning balance, Number of shares	140,427,761	131,585,612
Beginning balance, Ascribed value	$ 177,971	$ 164,069
Exercise of options, Number of shares	3,297,588	1,725,776
Exercise of options, Ascribed value	$ 1,133	$ 1,123
Restricted share units, Number of shares	412,501	412,501
Restricted share units, Ascribed value	$ 642	$ 424
Deferred share units, Number of shares		182,132
Deferred share units, Ascribed value		$ 189
Exercise of warrants, Number of shares		6,521,740
Exercise of warrants, Ascribed value		$ 12,166
Ending balance, Number of shares	144,137,850	140,427,761
Ending balance, Ascribed value	$ 179,746	$ 177,971