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ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Revenues from Collaboration and Licensing Agreements (Details) - Revenue from Contract with Customer - Revenue from Collaboration and Licensing Agreements	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Biogen MA, Inc.
Concentration Risk [Line Items]
Percentage of revenues	77.00%	26.00%	38.00%
Kite Pharma, Inc.
Concentration Risk [Line Items]
Percentage of revenues	12.00%	35.00%	23.00%
Novartis Institutes for BioMedical Research, Inc.
Concentration Risk [Line Items]
Percentage of revenues	7.00%	36.00%	34.00%
Other licensing agreements
Concentration Risk [Line Items]
Percentage of revenues	4.00%	3.00%	5.00%

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