Net Loss Per Share - Schedule of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings Per Share [Abstract]
Net loss attributable to Vir Bio	$ (437,987)	$ (521,960)	$ (615,061)
Weighted-average shares outstanding, basic (in shares)	138,520,419	136,246,865	134,130,924
Weighted-average shares outstanding, diluted (in shares)	138,520,419	136,246,865	134,130,924
Net loss per share attributable to VirBio, basic (in USD per share)	$ (3.16)	$ (3.83)	$ (4.59)
Net loss per share attributable to VirBio, diluted (in USD per share)	$ (3.16)	$ (3.83)	$ (4.59)