Contingencies and commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024	Oct. 31, 2014
Contingencies and Commitments [Line Items]
Fair value of contingent consideration	$ 8,604	$ 8,395	$ 10,524	$ 10,225
Recurring
Contingencies and Commitments [Line Items]
Fair value of contingent consideration	8,604	$ 8,395
Enantigen's Selling Shareholders | Recurring
Contingencies and Commitments [Line Items]
Fair value of contingent consideration	$ 8,600				$ 0
Enantigen's Selling Shareholders | Arbutus Inc.
Contingencies and Commitments [Line Items]
Development and regulatory milestones payment per licensed compound series, maximum					102,500
Development and regulatory milestones payment per royalty, maximum					$ 1,000