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Income taxes - Income tax reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2019
Income taxes
Combined federal and provincial statutory tax rate	27.00%	27.00%	27.00%
Income tax (recovery) at statutory rate	$ (5,848)	$ 43,677	$ (7,534)
Difference in foreign tax rates	(194)	2,424	(281)
Effect of foreign exchange changes		(4)
Non-deductible expenditures	937	1,009	4,061
Income from option payments applied as proceeds of sale		(8,812)
Return to provision adjustments	116	(6)	193
Impact of new lease accounting rules (ASC 842 adoption)		(28)
Expiry of losses			277
Change in valuation allowance	4,989	(38,260)	3,284
Income tax recovery (expense)	$ 0	$ 0	$ 0

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Percentage of domestic federal and provincial statutory tax rate applicable to pretax income (loss).

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to income from option payments.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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