Contingencies and commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022	Oct. 31, 2014
Contingencies and Commitments [Line Items]
Fair value of contingent consideration	$ 7,780	$ 7,600	$ 7,804	$ 7,531
Recurring
Contingencies and Commitments [Line Items]
Fair value of contingent consideration	7,780	$ 7,600
Enantigen's Selling Shareholders | Recurring
Contingencies and Commitments [Line Items]
Fair value of contingent consideration	$ 7,800				$ 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