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Contingencies and commitments	9 Months Ended
Contingencies and commitments	Sep. 30, 2025
Commitments and Contingencies Disclosure [Abstract]
Contingencies and commitments	Contingencies and commitments Stock Purchase Agreement with Enantigen In October 2014, Arbutus Biopharma, Inc., the Company’s wholly-owned subsidiary, acquired all of the outstanding shares of Enantigen Therapeutics, Inc. (Enantigen) pursuant to a stock purchase agreement. The amount paid to Enantigen’s selling shareholders could be up to an additional $102.5 million in sales performance milestones in connection with the sale of the first commercialized product by the Company for the treatment of HBV, regardless of whether such product is based upon assets acquired under this agreement, and a low single-digit royalty on net sales of such first commercialized HBV product, up to a maximum royalty payment of $1.0 million that, if paid, would be offset against the Company’s milestone payment obligations. Certain other development milestones related to the acquisition were tied to programs which are no longer under development by the Company, and therefore the contingency related to those development milestones is zero. The contingent consideration is a financial liability and is measured at its fair value at each reporting period, with any changes in fair value from the previous reporting period recorded in the condensed consolidated statements of operations and comprehensive income (loss) (see Note 3). The fair value of the contingent consideration was $11.1 million as of September 30, 2025.