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Basis of Presentation and Summary of Significant Accounting Policies - Revenue by Source (Details) - USD ($) $ in Thousands | 2 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 05, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | $ 43,484 | $ 56,157
Royalties |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 19,538 | 20,820
Promacta |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 14,200 | 14,193 | 15,573
Kyprolis |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 3,833 | 3,262
Evomela |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 911 | 1,600
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 601 | 385
Material Sales: Captisol |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 8,959 | 4,391
License fees, milestones and other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 14,987 | 30,946
License Fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 850 | 26,955
Milestone |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 11,932 | 2,825
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | $ 2,205 | $ 1,166

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