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Collaboration Agreements - Transaction Price Related to Consideration Received and Accounts Receivable Allocated to Performance Obligations along with Associated Deferred Revenue (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Unbilled contract asset	$ 130,000	$ 180,000
Deferred revenue	3,442	54,790
Net unbilled contract asset	126,558	$ 125,210
Europe [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Unbilled contract asset	130,000
Astellas Agreement [Member] | Europe [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Unbilled contract asset	130,000
Deferred revenue	3,442
Astellas Agreement [Member] | Europe [Member] | Prepaid Expenses and Other Current Assets [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net unbilled contract asset	$ 126,600

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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Amount of consideration paid in advance for supplies that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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-Publisher FASB
-Name Accounting Standards Codification
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