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Commitments and Contingencies - Litigation (Details)
€ in Millions, $ in Millions
1 Months Ended
Jun. 30, 2018
USD ($)
Nov. 30, 2016
USD ($)
Nov. 30, 2016
EUR (€)
Ipsen Agreement      
Loss Contingencies [Line Items]      
Monetary value of claims   $ 61.6 € 50
Amount awarded to other party $ 10.0    
Amount received upon marketing approval 5.0    
Litigation settlement expense 10.0    
Litigation settlement interest 0.8    
Teijin Agreement      
Loss Contingencies [Line Items]      
License agreement, upfront payment received 10.0    
License agreement, upfront payment received, aggregate $ 40.0