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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - (Tables)
3 Months Ended
Mar. 31, 2021
Kite Pharma, Inc.  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Revenues Recognized under Agreement
Revenues recognized under the agreement for the three months ended March 31, 2021 and 2020 were as follows (in thousands):
Three Months Ended
March 31,
20212020
Revenue related to Kite agreement:
Recognition of license and stand-ready fee$6,159 $6,227 
Research services129 992 
Total$6,288 $7,219 
Sanofi Genzyme  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Revenues Recognized under Agreement
Revenues recognized under the agreement for the three months ended March 31, 2021 and 2020 were as follows (in thousands):
Three Months Ended
March 31,
20212020
Revenue related to Sanofi agreement:
Recognition of upfront fee$227 $(729)
Research services679 1,720 
Milestone achievement154 (492)
Total$1,060 $499