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ORGANIZATION, BASIS OF PRESENTATION, AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenues from Strategic Partnering Collaboration Agreements and Research Activity Grants (Detail) - Revenue from contract with customer - Customer concentration risk	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Biogen MA, Inc.
Concentration Risk [Line Items]
Percentage of revenues	39.00%	38.00%	39.00%	24.00%
Novartis Institutes for BioMedical Research, Inc.
Concentration Risk [Line Items]
Percentage of revenues	34.00%	0.00%	32.00%	0.00%
Kite Pharma, Inc.
Concentration Risk [Line Items]
Percentage of revenues	23.00%	34.00%	23.00%	42.00%
Sanofi Genzyme
Concentration Risk [Line Items]
Percentage of revenues	3.00%	8.00%	4.00%	7.00%
Pfizer Inc.
Concentration Risk [Line Items]
Percentage of revenues	0.00%	18.00%	0.00%	21.00%

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