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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 | 9 Months Ended
--- | --- | --- | ---
Mar. 06, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenue |  | $ 24,808 | $ 45,663 | $ 93,279 | $ 191,863
Royalties |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenue |  | 9,767 | 36,127 | 35,931 | 88,343
Promacta |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenue | $ 14,200 | 0 | 27,812 | 14,193 | 68,191
Kyprolis |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenue |  | 7,602 | 6,286 | 16,317 | 14,411
Evomela |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenue |  | 1,515 | 1,356 | 3,570 | 4,116
Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenue |  | 650 | 673 | 1,851 | 1,625
Material Sales: Captisol |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenue |  | 6,849 | 7,027 | 24,357 | 19,030
License fees, milestones and other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenue |  | 8,192 | 2,509 | 32,991 | 84,490
License Fees |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenue |  | 243 | 265 | 3,083 | 75,201
Milestone |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenue |  | 4,790 | 1,308 | 20,897 | 6,052
Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenue |  | $ 3,159 | $ 936 | $ 9,011 | $ 3,237

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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