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Contingencies and commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021	Oct. 31, 2014
Contingencies and Commitments [Line Items]
Fair value of contingent consideration	$ 7,168	$ 7,531	$ 5,707	$ 5,298
Recurring
Contingencies and Commitments [Line Items]
Fair value of contingent consideration	7,168	$ 7,531
Enantigen's Selling Shareholders | Recurring
Contingencies and Commitments [Line Items]
Fair value of contingent consideration	$ 7,200				$ 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

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