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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
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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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