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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Revenues Recognized under Agreement (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |
Revenues | $ 13,076 | $ 8,071
Kite Pharma Inc |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |
Revenues | 7,219 | 8,312
Kite Pharma Inc | Collaboration Agreements |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |
Revenues | 6,227 | 6,159
Kite Pharma Inc | Research Services |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |
Revenues | 992 | 2,153
Pfizer SB-525 |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |
Revenues | 3,183 | (3,040)
Pfizer SB-525 | Collaboration Agreements |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |
Revenues | 2,190 | (3,040)
Pfizer SB-525 | Milestone Achievement |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |
Revenues | 993 | 0
Pfizer | Collaboration Agreements |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |
Revenues | 360 | 615
Sanofi |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |
Revenues | 499 | 1,949
Sanofi | Collaboration Agreements |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |
Revenues | (729) | 752
Sanofi | Research Services |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |
Revenues | 1,720 | 1,197
Sanofi | Milestone Achievement |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |
Revenues | $ (492) | $ 0

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