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Shareholders’ equity - Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price (in USD per share)	$ 3.39	$ 0	$ 3.33	$ 2.49
Restricted stock units granted during period (in shares)	1,066,609	0	1,968,509	1,316,200
Grant date fair value (in USD per share)	$ 3.82	$ 0	$ 3.58	$ 2.40
Allocated share-based compensation expense	$ 1,202	$ 2,160	$ 3,259	$ 7,354
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	566	847	1,495	3,007
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 636	$ 1,313	$ 1,764	$ 4,347
Arbutus Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted during period (in shares)	557,600	0	5,263,722	4,163,000

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

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