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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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