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Collaborative Research, Development and License Agreements - Additional Information (Detail) $ in Thousands	1 Months Ended			3 Months Ended			9 Months Ended
	Feb. 29, 2020 USD ($)	Feb. 28, 2019 USD ($)	Feb. 28, 2018 USD ($) Installment	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized					$ 13,414	$ 10,575	$ 27,001	$ 24,649
Other current liabilities					8,849		8,849		$ 9,987
Intangible assets, net									2,500
Product
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized					13,276	10,158	26,195	24,086
Serum Institute of India Pvt. Ltd. | Collaboration Revenue
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized					100	$ 0	800	$ 100
Reservation Agreement | Coalition for Epidemic Preparedness Innovations
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue					6,300		6,300
Reservation Agreement | Coalition for Epidemic Preparedness Innovations | Product
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized					0
Reservation Agreement | Coalition for Epidemic Preparedness Innovations | Forecast
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized				$ 6,300
Reservation fees				$ 6,300
Supply Agreement | Valneva SE
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue					14,200		14,200
Other current liabilities					5,700		5,700
Grant Agreement | Bill & Melinda Gates Foundation
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue					1,200		1,200
Grant Agreement | Bill & Melinda Gates Foundation | Maximum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Proceeds from grant							3,400
Global Access and Strategy/Commitment Agreement | Bill & Melinda Gates Foundation
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Grants receivable					$ 2,200		$ 2,200
Sublicense Agreement | Merck, Sharp & Dohme Corp.
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Aggregate amount payable to acquire intangible assets			$ 21,000
Number of installments | Installment			3
Payment upon obligation	$ 7,000	$ 7,000	$ 7,000
Agreement expiration month and year			2020-04
Intangible assets, net									$ 2,500

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