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ORGANIZATION, BASIS OF PRESENTATION, AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - (Tables)
 6 Months Ended
Jun. 30, 2022
Accounting Policies [Abstract]  
Schedule of Revenue from Strategic Partnering Collaboration Agreements and Research Activity Grants as a Percentage of Total Revenues
Revenues from major collaboration agreements and research activity grants as a percentage of total revenues were as follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
2022202120222021
Novartis Institutes for BioMedical Research, Inc.37 %34 %34 %32 %
Biogen MA, Inc.34 %39 %37 %39 %
Kite Pharma, Inc.22 %23 %22 %23 %
Sanofi S.A.6 %3 %6 %4 %
Schedule of Cash and Cash Equivalents A reconciliation of cash, cash equivalents, and restricted cash reported within the Condensed Consolidated Balance Sheets to the amounts reported within the accompanying Condensed Consolidated Statements of Cash Flows is as follows (in thousands):
June 30,
2022		December 31,
2021		June 30,
2021		December 31,
2020
Cash and cash equivalents$117,705 $178,872 $169,878 $131,329 
Non-current restricted cash1,500 1,500 1,500 1,500 
Cash, cash equivalents, and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows$119,205 $180,372 $171,378 $132,829 
Restrictions on Cash and Cash Equivalents A reconciliation of cash, cash equivalents, and restricted cash reported within the Condensed Consolidated Balance Sheets to the amounts reported within the accompanying Condensed Consolidated Statements of Cash Flows is as follows (in thousands):
June 30,
2022		December 31,
2021		June 30,
2021		December 31,
2020
Cash and cash equivalents$117,705 $178,872 $169,878 $131,329 
Non-current restricted cash1,500 1,500 1,500 1,500 
Cash, cash equivalents, and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows$119,205 $180,372 $171,378 $132,829