Nature of the business and organization (Details) treatmentCourse in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) segment category product productCandidate Category treatmentCourse
Asset Acquisition [Line Items]
Number of categories of public health threats | category	5
Number of revenue generating products | product	13
Number of product candidates | productCandidate	1
Number of product and service categories | Category	3
Number of reportable segments | segment	2
Number of operating segments | segment	2
Chimerix Asset Acquisition
Asset Acquisition [Line Items]
Payments to acquire productive assets	$ 238.0
Finite-lived intangible assets acquired	156.9
Asset acquisition, inventory acquired	$ 82.3
Asset acquisition, domestic royalty percentage	20.00%
Asset acquisition, treatment volume threshold | treatmentCourse	1.7
Asset acquisition, international royalty percentage	15.00%
Chimerix Asset Acquisition | Milestone Payments
Asset Acquisition [Line Items]
Asset acquisition, consideration transferred, contingent consideration	$ 124.0
Chimerix Asset Acquisition | Regulatory Milestones
Asset Acquisition [Line Items]
Asset acquisition, consideration transferred, contingent consideration	$ 12.5