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Collaboration Agreements (Mitsubishi Tanabe Pharma) (Details) - Mitsubishi Tanabe Pharma Corporation (MTPC) - Collaborative Arrangement - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2015
Jun. 30, 2017
Mar. 31, 2016
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Deferred Revenue, Additions $ 10.0    
Revenue Recognition, Milestone Method, Revenue Recognized   $ 30.0  
First Payment [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Deferred Revenue, Additions     $ 45.0
Second Payment [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Deferred Revenue, Additions     $ 15.0