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Collaboration Agreements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Collaborative Agreements      
License fee expense $ 0.1 $ 0.7 $ 0.7
Type of cost of goods sold line item us-gaap:LicenseMember us-gaap:LicenseMember us-gaap:LicenseMember
Southampton      
Collaborative Agreements      
Potential milestone payment $ 1.0    
Amgen      
Collaborative Agreements      
Potential milestone payment 0.9    
Yale      
Collaborative Agreements      
Potential milestone payment $ 3.0    
MedImmune      
Collaborative Agreements      
Period from the first commercial sale of licensed product for royalty payment 10 years    
MedImmune | Obtaining specified regulatory and development      
Collaborative Agreements      
Potential milestone payment $ 45.0    
MedImmune | Specified annual net sales thresholds are met      
Collaborative Agreements      
Potential milestone payment $ 125.0