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Allergan In-Licensing Agreement (FY) (Details) - USD ($)
$ in Millions
1 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2015
Sep. 30, 2018
Dec. 31, 2017
Forecast          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Maximum expected number of days from request to end-of-review meeting 30 days        
Allergan | Vitaros          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
License cost payments     $ 1.0    
Payments to Allergan, research and development   $ 1.5 $ 1.0    
License fees, potential future milestone payments receivable       $ 25.0 $ 25.0