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Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Millions
Jul. 05, 2016
Sep. 30, 2017
Dec. 31, 2016
Acquisitions      
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01
MiaMed Inc      
Acquisitions      
Asset acquisition, total consideration, stock and cash $ 6.5    
Asset acquisition, cash consideration paid 1.8    
Asset acquisition, potential aggregate deal value 89.5    
Charges to research and development expense for stock issued in asset acquisition $ 6.5    
MiaMed Inc | Amicus | Common Stock      
Acquisitions      
Asset acquisition, consideration paid in common stock 825,603    
Common stock, par value (in dollars per share) $ 0.01    
Clinical, Regulatory and Commercial milestones | MiaMed Inc | Maximum      
Acquisitions      
Contingent consideration payable upon achievement of milestones $ 83.0