Government Contracts - Additional Information (Detail) $ in Thousands	1 Months Ended		3 Months Ended
	May 31, 2021 USD ($) Option	Jul. 31, 2018 USD ($)	Mar. 31, 2024 USD ($) Option	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jan. 19, 2022 USD ($)	Jan. 31, 2020 USD ($)	May 31, 2019 USD ($)
Government Contracts [Line Items]
Grant revenue			$ 9,267	$ 2,069
BARDA and DTRA [Member]
Government Contracts [Line Items]
Maximum potential funding from government contract			69,700
Potential grant amount exercised			12,700
BARDA [Member]
Government Contracts [Line Items]
Potential contract amount awarded		$ 44,200				$ 60,300
Potential amount additional funding awarded						12,900
Overall potential award increased						$ 47,600
Award received for clinical development					$ 12,900
BARDA [Member] | Base Period Contracts [Member]
Government Contracts [Line Items]
Potential amount initial funding awarded		$ 15,700
Potential amount additional funding awarded								$ 2,500
Overall potential award increased								46,800
Contract term		3 years
BARDA [Member] | Base Period Contracts [Member] | Maximum [Member]
Government Contracts [Line Items]
Potential amount initial funding awarded								18,200
BARDA [Member] | Base Period Contracts [Member] | Minimum [Member]
Government Contracts [Line Items]
Potential amount initial funding awarded								$ 15,700
BARDA [Member] | Grant [Member]
Government Contracts [Line Items]
Grant revenue			4,900	500
BARDA [Member] | First Option [Member]
Government Contracts [Line Items]
Potential amount additional funding awarded							$ 15,900
Potential Amount Subsequently Funding Awarded							600
Potential amount increase in committed funding							$ 34,700
BARDA [Member] | Second Option [member]
Government Contracts [Line Items]
Potential grant amount awarded			12,700
DTRA [Member] | Maximum [Member]
Government Contracts [Line Items]
Potential amount additional funding awarded			10,000
Niaid [Member] | SPR206 [Member]
Government Contracts [Line Items]
Contract term	5 years
Potential amount increase in committed funding			2,200
Grant revenue			200	$ 900
Award received for clinical development	$ 23,500
Number of option period for funding from government contract | Option	6
Niaid [Member] | First Option [Member] | SPR206 [Member]
Government Contracts [Line Items]
Potential amount increase in committed funding			$ 4,000
Number of option period for funding from government contract | Option			1
Niaid [Member] | Third Option [Member] | SPR206 [Member]
Government Contracts [Line Items]
Potential amount increase in committed funding			$ 800
Number of option period for funding from government contract | Option			3