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Sale of Vernalis R&D and Promacta License - Narrative (Details) - USD ($) $ in Thousands |  |  | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 02, 2020 | Mar. 06, 2019 | Mar. 06, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 01, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds on sale of Vernalis R&D, net |  |  |  | $ 22,061 | $ 0 | $ 0 |
Intangible assets, net (excluding goodwill) |  |  |  | 595,330 | $ 210,448 |  |
Vernalis | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds on sale of Vernalis R&D, net | $ 26,700 |  |  |  |  |  |
Goodwill written off | $ 3,500 |  |  |  |  |  |
Gain from sale of intangible assets |  |  |  | $ 17,100 |  |  |
Vernalis | In Process Research and Development | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Intangible assets, net (excluding goodwill) |  |  |  |  |  |  | $ 6,100
Promacta | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds on sale of Vernalis R&D, net |  | $ 827,000 |  |  |  |  |
Gain from sale of intangible assets |  |  | $ 812,800 |  |  |  |
Total revenues |  |  | 14,200 |  |  |  |
Promacta | In Process Research and Development | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Intangible assets, net (excluding goodwill) |  | $ 0 | $ 0 |  |  |  |

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