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Sale of Promacta License - Narrative (Details) - USD ($) | 2 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 05, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenue and gain from disposition of intangible assets |  | $ 827,000,000.0 |  |
Intangible assets, net |  | 216,290,000 |  | $ 219,793,000
Revenue |  | 43,484,000 | $ 56,157,000 |
Gain from sale of Promacta license |  | 812,797,000 | 0 |
Promacta |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenue | $ 14,200,000 | 14,193,000 | $ 15,573,000 |
In Process Research and Development | Promacta |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Intangible assets, net |  | $ 0 |  |

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