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Major Customers, Partnerships and Strategic Alliances - Revenues Recognized under Agreement (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	$ 17,548	$ 21,416	$ 25,619	$ 34,053
Kite Pharma Inc
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	9,060	7,515	17,372	7,515
Kite Pharma Inc | Collaboration Agreements
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	6,227	5,953	12,386	5,953
Kite Pharma Inc | Research Services
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	2,833	1,562	4,986	1,562
Pfizer SB-525 | Collaboration Agreements
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	4,635	8,183	1,595	15,841
Pfizer
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues			25,600
Pfizer | Collaboration Agreements
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	455	617	1,070	1,076
Bioverativ Inc
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	3,059	4,516	5,009	8,898
Bioverativ Inc | Collaboration Agreements
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	901	1,184	1,654	2,338
Bioverativ Inc | Research Services
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	$ 2,158	$ 3,332	$ 3,355	$ 6,560

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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