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Basis of Presentation and Summary of Significant Accounting Policies - Revenue by Source (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 90,043 | $ 27,995 | $ 146,200 | $ 57,264
Material Sales: Captisol |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 7,612 | 5,550 | 12,003 | 6,672
License fees, milestones and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 51,035 | 8,234 | 81,981 | 12,151
License Fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 47,981 | 666 | 74,936 | 3,538
Milestone |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 1,919 | 4,497 | 4,744 | 5,505
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 1,135 | $ 3,071 | $ 2,301 | $ 3,108

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