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Sale of Promacta License - Narrative (Details) - USD ($) |  | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 06, 2019 | Mar. 06, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Revenue from Contract with Customers and Gain (Loss) on Disposition of Intangible Assets | $ 827,000,000.0 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) |  |  | $ 210,448,000 | $ 219,793,000 |
Gain from sale of Promacta license |  | $ 812,800,000 | $ 812,797,000 | $ 0 | $ 0
Promacta |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Total revenues |  | 14,200,000 |  |  |
In Process Research and Development | Promacta |  |  |  |  |
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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