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Summary of Unaudited Quarterly Financial Information - Textuals (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Restructuring Charges $ 28.4    
argenx [Member]      
Disaggregation of Revenue [Line Items]      
Proceeds from Collaborator   $ 30.0  
Roche      
Disaggregation of Revenue [Line Items]      
Proceeds from Collaborator     $ 30.0