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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 |  |

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