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License and Collaboration Agreements (Details) - Product - Adaptimmune - USD ($)
3 Months Ended
Mar. 31, 2020
Jun. 30, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]    
Revenue $ 1,100,000  
Maximum    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]    
Potential future milestones receivable (up to) 288,000,000.0  
Upfront License Payment    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]    
Upfront payments   $ 2,000,000.0
Research Support Payment    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]    
Upfront payments $ 750,000