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ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenues from Strategic Partnering Collaboration Agreements and Research Activity Grants (Details) - Revenue from contract with customer - Customer concentration risk
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Novartis Institutes for BioMedical Research, Inc.        
Concentration Risk [Line Items]        
Percentage of revenues 35.00% 37.00% 7.00% 34.00%
Biogen MA, Inc.        
Concentration Risk [Line Items]        
Percentage of revenues 32.00% 34.00% 82.00% 37.00%
Kite Pharma, Inc.        
Concentration Risk [Line Items]        
Percentage of revenues 18.00% 22.00% 8.00% 22.00%
Sanofi S.A.        
Concentration Risk [Line Items]        
Percentage of revenues 0.00% 6.00% 0.00% 6.00%