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License and Collaboration Agreements - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2019
Dec. 31, 2019
Sep. 30, 2020
Research And Development Arrangement Contract To Perform For Others [Line Items]      
Payments on license agreement milestone in acquired in process research and development expenses     $ 10,000,000.0
Agenus Agreement      
Research And Development Arrangement Contract To Perform For Others [Line Items]      
Upfront fee $ 10,000,000.0    
Maximum amount payable upon achieving certain clinical development and regulatory milestones 115,000,000.0    
Maximum amount payable upon achieving certain commercial milestones $ 85,000,000.0    
License agreement milestone in acquired in-process research and development expenses   $ 10,000,000.0  
Agenus Agreement | After First Commercial Sale of Licensed Product      
Research And Development Arrangement Contract To Perform For Others [Line Items]      
License agreement expiration term 15 years    
Maximum | Agenus Agreement      
Research And Development Arrangement Contract To Perform For Others [Line Items]      
Royalty ranging on net sales of licensed products 20.00%    
Minimum | Agenus Agreement      
Research And Development Arrangement Contract To Perform For Others [Line Items]      
Royalty ranging on net sales of licensed products 14.00%    
Allergan/AbbVie | License Agreement      
Research And Development Arrangement Contract To Perform For Others [Line Items]      
Milestone payments received for licensing agreement     25,000,000.0
Allergan/AbbVie | License Agreement | Maximum      
Research And Development Arrangement Contract To Perform For Others [Line Items]      
License agreement additional milestone payments eligible to receive     $ 200,000,000.0