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Basis of Presentation and Summary of Significant Accounting Policies - Revenue by Source (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 41,848 | $ 24,808 | $ 116,429 | $ 93,279
Royalties |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 9,005 | 9,767 | 22,751 | 35,931
Kyprolis |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 6,923 | 7,602 | 16,809 | 16,317
Evomela |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 1,802 | 1,515 | 4,577 | 3,570
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 280 | 650 | 1,365 | 1,851
Promacta |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 0 | 0 | 0 | 14,193
Captisol |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 23,389 | 6,849 | 68,966 | 24,357
Contract revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 9,454 | 8,192 | 24,712 | 32,991
Service Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 7,341 | 4,548 | 15,280 | 12,990
License Fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 158 | 243 | 1,793 | 3,083
Milestone |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 960 | 2,674 | 4,766 | 15,425
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 995 | $ 727 | $ 2,873 | $ 1,493

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