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Development and License Agreements - Additional Information (Detail) - USD ($)	1 Months Ended			9 Months Ended
	Jul. 31, 2025	Sep. 30, 2022	Sep. 30, 2020	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Sep. 30, 2023
BARDA Agreement
Licenses Agreements [Line Items]
Additional committed fund receivable							$ 3,500,000
Committed fund receivable				$ 185,500,000
Reduction in committed fund receivable				8,800,000
Committed fund receivable				270,200,000
Receivable of billed and unbilled amounts				2,900,000	$ 2,400,000
BARDA Agreement \| Cerus Corporation \| Maximum
Licenses Agreements [Line Items]
Co-investment by the company				1,400,000
2024 BARDA Agreement
Licenses Agreements [Line Items]
Committed fund receivable						$ 32,100,000
Committed fund receivable				188,400,000
2024 BARDA Agreement \| Accounts Receivable, Net
Licenses Agreements [Line Items]
Receivable of billed and unbilled amounts				800	100
2024 BARDA Agreement \| Cerus Corporation \| Maximum
Licenses Agreements [Line Items]
Co-investment by the company				60,100,000
FDA Agreement
Licenses Agreements [Line Items]
Contract agreement term			5 years
Total potential contract value				11,100,000
FDA Agreement \| Accounts Receivable, Net
Licenses Agreements [Line Items]
Receivable of billed and unbilled amounts				0	500,000
DoD and IBAS Program Agreement \| Accounts Receivable, Net
Licenses Agreements [Line Items]
Receivable of billed and unbilled amounts				1,600,000	1,000,000
DoD and IBAS Program Agreement \| Deferred Revenue
Licenses Agreements [Line Items]
Receivable of billed and unbilled amounts				$ 1,300,000	$ 500,000
DoD and IBAS Program Agreement \| Maximum
Licenses Agreements [Line Items]
Total contract value	$ 25,000,000	$ 17,800,000
DoD and IBAS Program Agreement \| Minimum
Licenses Agreements [Line Items]
Total contract value	$ 7,200,000	$ 9,100,000