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Licenses (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
License agreement | MSSM    
Licenses    
Upfront and annual license fees paid $ 0  
Potential milestone payments 0  
Royalty expense $ 7,600,000  
Celenex    
Licenses    
Contingent consideration based on the achievement of certain milestones   $ 15,000,000
Nationwide Children's Hospital | Celenex    
Licenses    
Contingent consideration based on the achievement of certain milestones   $ 7,800,000