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Shareholders’ equity - Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price (in USD per share)	$ 3.31	$ 2.40
Restricted stock units granted during period (in shares)	901,900	1,316,200
Grant date fair value (in USD per share)	$ 3.29	$ 2.40
Allocated share-based compensation expense	$ 1,293	$ 2,014
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	555	1,041
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 738	$ 973
Arbutus Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted during period (in shares)	3,943,722	3,738,800

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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