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Major Customers, Partnerships and Strategic Alliances (Tables)
12 Months Ended
Dec. 31, 2019
Kite Pharma, Inc. ("Kite")  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Revenues recognized under agreement
Revenues recognized under the agreement were as follows (in thousands):
Year Ended December 31,
20192018
Revenue related to Kite agreement:
Recognition of license and stand-ready fee$24,977  $18,545  
Research services9,373  6,972  
Total$34,350  $25,517  
Pfizer SB-525  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Revenues recognized under agreement
Revenues recognized under the agreement were as follows (in thousands):
Year Ended December 31,
201920182017
Revenue related to Pfizer SB-525 agreement:
Recognition of upfront fee and research services$15,697  $37,810  $17,008  
Milestone achievement23,662  —  —  
Total$39,359  $37,810  $17,008  
Pfizer C9ORF72  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Revenues recognized under agreement
Revenues recognized under the agreement were as follows (in thousands):
Year Ended December 31,
201920182017
Recognition of upfront fee related to Pfizer C9ORF72 agreement
$1,827  $2,188  $—  
Sanofi  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Revenues recognized under agreement
Revenues recognized under the agreement were as follows (in thousands):
Year Ended December 31,
201920182017
Revenue related to Sanofi agreement:
Recognition of upfront fee$3,494  $4,013  $1,769  
Research services6,367  9,503  10,489  
Milestone achievement12,819  —  —  
Total$22,680  $13,516  $12,258