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Amount of expense for research and development. Includes, but is not limited to, cost for computer software product to be sold, leased, or otherwise marketed and writeoff of research and development assets acquired in transaction other than business combination or joint venture formation or both. Excludes write-down of intangible asset acquired in business combination or from joint venture formation or both, used in research and development activity.

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Costs and expenses for the period incurred under the collaboration agreements.

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Maximum aggregate milestone payment for achievement of specified annual net sales

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Maximum Number Of Other Infectious Disease Targets Selected

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Collaboration and License Agreements - Alnylam Pharmaceuticals, Inc. (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2017 USD ($) diseaseTarget	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Research and development		$ 455,966	$ 506,499	$ 579,720
Alnylam Pharmaceuticals Inc \| Alnylam Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Research and development		30,000
Royalty payment obligation expiration period after first commercial sales (in years)	10 years
Expenses incurred under agreement		$ 0	$ 0	$ 1,700
Alnylam Pharmaceuticals Inc \| First siRNA Product HBV \| Alnylam Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Maximum number of other infectious disease targets selected by VirBio \| diseaseTarget	4
Maximum milestone payment for achievement of specified development and regulatory milestones	$ 145,000
Maximum aggregate sales milestone payment	$ 250,000