Collaborative and Other Relationships (Details) $ in Thousands						1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 25, 2022 USD ($) dose	Sep. 15, 2021 USD ($)	Nov. 05, 2019 USD ($)	Sep. 06, 2018 USD ($) dose	Sep. 30, 2013 USD ($)	Aug. 31, 2020 USD ($)	Jun. 30, 2000 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) dose	Sep. 30, 2021 USD ($)	Mar. 31, 2015 USD ($)
Collaborative and Other Relationships [Line Items]
Total revenues								$ 75,827	$ 40,994	$ 191,282	$ 110,012
U.S. Department of Health and Human Services
Collaborative and Other Relationships [Line Items]
Collaborative agreement contract value				$ 34,660
Contract term (in years)				5 years
U.S. Department of Health and Human Services | RAPIVAB
Collaborative and Other Relationships [Line Items]
Maximum number of products, doses | dose				50,000						50,000
Number of doses delivered, doses | dose	10,000									39,980
Proceeds from collaborators	$ 6,932									$ 27,714
Torii Pharmaceutical Co. [Member]
Collaborative and Other Relationships [Line Items]
Total revenues			$ 22,000
Potential milestone payments receivable if regulatory approval before specified date			$ 15,000
Maximum customary reduction on royalty rate			50.00%
Royalty payments receivable, expiration term from first commercial (in years)			10 years
Torii Pharmaceutical Co. [Member] | Minimum
Collaborative and Other Relationships [Line Items]
Royalty rate if maintains sakigake designation			20.00%
Torii Pharmaceutical Co. [Member] | Maximum
Collaborative and Other Relationships [Line Items]
Royalty rate if maintains sakigake designation			40.00%
Base Contract
Collaborative and Other Relationships [Line Items]
Government contract receivable												$ 16,265
Additional Development Options
Collaborative and Other Relationships [Line Items]
Government contract receivable												22,855
ASPRBARDA Contract
Collaborative and Other Relationships [Line Items]
Government contract receivable												$ 39,120
Proceeds from awards for research and development contracts										$ 20,574
AECOM and IRL
Collaborative and Other Relationships [Line Items]
Milestone payment minimum							$ 1,400
Milestone payment maximum							4,000
Annual license fee minimum							150
Annual license fee maximum							$ 500
National Institute of Allergy and Infectious Diseases
Collaborative and Other Relationships [Line Items]
Expected receivable from awards for research and development contracts		$ 47,315			$ 45,931
Potential aggregate maximum amount of funding						$ 43,908
Collaborative agreement contract value						$ 6,326
UAB
Collaborative and Other Relationships [Line Items]
Period of agreement (in years)										25 years
Renewable period of agreement (in years)										5 years