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Collaborative Research, Development and License Agreements - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 29, 2020 USD ($) | Feb. 28, 2019 USD ($) | Feb. 28, 2018 USD ($) Installment | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Revenue recognized |  |  |  | $ 2,668 | $ 8,301 | $ 13,587 | $ 14,074 |
Intangible assets, net |  |  |  |  |  |  |  | $ 2,500
Serum Institute of India Pvt. Ltd. | Collaboration Revenue |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Revenue recognized |  |  |  | $ 300 | $ 0 | $ 700 | $ 100 |
Merck, Sharp & Dohme Corp. | Sublicense Agreement |  |  |  |  |  |  |  |
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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