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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Revenues Recognized under Agreement (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	$ 28,231	$ 26,280
Novartis Institutes for BioMedical Research, Inc.
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	8,895	7,861
Novartis Institutes for BioMedical Research, Inc. | Recognition of upfront fee
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	7,018	6,200
Novartis Institutes for BioMedical Research, Inc. | Research services
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	1,877	1,661
Biogen MA, Inc.
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	11,193	10,451
Biogen MA, Inc. | Recognition of upfront fee
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	7,306	7,306
Biogen MA, Inc. | Research services
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	3,887	3,145
Kite Pharma, Inc.
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	6,308	6,288
Kite Pharma, Inc. | Recognition of upfront fee
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	6,159	6,159
Kite Pharma, Inc. | Research services
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	149	129
Sanofi
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	1,499	1,060
Sanofi | Recognition of upfront fee
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	311	227
Sanofi | Research services
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	978	679
Sanofi | Milestone achievement
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	$ 210	$ 154

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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