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Collaborative Research, Development and License Agreements - Additional Information (Detail) $ in Thousands	1 Months Ended			3 Months Ended
	Feb. 29, 2020 USD ($)	Feb. 28, 2019 USD ($)	Feb. 28, 2018 USD ($) Installment	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized				$ 10,919	$ 5,773
Intangible assets, net				202		$ 2,500
Serum Institute of India Pvt. Ltd. | Collaboration Revenue
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized				400	$ 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				$ 200		$ 2,500

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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