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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