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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Revenues Recognized under Agreement (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Revenues | $ 28,563 | $ 57,763 | $ 82,715 | $ 92,392
Novartis Institutes for BioMedical Research, Inc. |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Revenues | 11,514 | 0 | 28,956 | 0
Novartis Institutes for BioMedical Research, Inc. | Recognition of upfront fee |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Revenues | 9,093 | 0 | 22,852 | 0
Novartis Institutes for BioMedical Research, Inc. | Research services |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Revenues | 2,421 | 0 | 6,104 | 0
Biogen MA, Inc. |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Revenues | 10,967 | 9,621 | 32,184 | 17,799
Biogen MA, Inc. | Recognition of upfront fee |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Revenues | 7,306 | 7,306 | 21,918 | 14,050
Biogen MA, Inc. | Research services |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Revenues | 3,661 | 2,315 | 10,266 | 3,749
Kite Pharma, Inc. |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Revenues | 6,409 | 7,294 | 19,021 | 21,935
Kite Pharma, Inc. | Recognition of upfront fee |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Revenues | 6,296 | 6,296 | 18,682 | 18,750
Kite Pharma, Inc. | Research services |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Revenues | 113 | 998 | 339 | 3,185
Sanofi |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Revenues | (759) | 1,498 | 1,258 | 3,789
Sanofi | Recognition of upfront fee |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Revenues | (1,125) | 321 | (692) | (28)
Sanofi | Research services |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Revenues | 1,125 | 961 | 2,417 | 3,836
Sanofi | Milestone achievement |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Revenues | $ (759) | $ 216 | $ (467) | $ (19)

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