Subsequent Events	3 Months Ended
Jun. 30, 2026
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Pursuant to the Settlement Agreement with Moderna as described in Note 5 above, Genevant received $771.6 million for its portion of the Fixed Payment on July 8, 2026. Genevant’s parent, GSL, expects to distribute up to $188 million of the Fixed Payment to non-RSL common shareholders of GSL, including Arbutus, and holders of equity awards granted under the GSL 2018 Equity Incentive Plan, through a combination of dividends and dividend equivalent rights payments. In addition, as described in Note 6 above, as of June 30, 2026, the Company accrued compensation-related expenses of $22.9 million for employee bonus arrangements expected to be paid in relation to the Settlement Agreement.

Subsequent Events

3 Months Ended

Jun. 30, 2026

Pursuant to the Settlement Agreement with Moderna as described in Note 5 above, Genevant received $771.6 million for its portion of the Fixed Payment on July 8, 2026. Genevant’s parent, GSL, expects to distribute up to $188 million of the Fixed Payment to non-RSL common shareholders of GSL, including Arbutus, and holders of equity awards granted under the GSL 2018 Equity Incentive Plan, through a combination of dividends and dividend equivalent rights payments. In addition, as described in Note 6 above, as of June 30, 2026, the Company accrued compensation-related expenses of $22.9 million for employee bonus arrangements expected to be paid in relation to the Settlement Agreement.