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Fair Value Measurements (Acquisition of CyDex) (Details) - Cydex Pharmaceuticals, Inc - Contingent Consideration Classified as Equity | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Credit Derivatives [Line Items] |  |
Revenue volatility (as a percent) | 25.00% | 25.00%
Average probability of commercialization (as a percent) | 12.50% | 12.50%
Market price of risk | 0.03 | 0.03
Credit rating | BB | BB
Equity risk premium (as a percent) | 6.00% | 6.00%

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