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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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