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Sale of Promacta License - Narrative (Details) - USD ($) |  | 2 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 06, 2019 | Mar. 06, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 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 |  |  | $ 216,268,000 |  | $ 216,268,000 |  | $ 219,793,000
Revenue |  |  | 24,808,000 | $ 45,663,000 | 93,279,000 | $ 191,863,000 |
Gain from sale of Promacta license |  | $ 812,800,000 | 0 | 0 | 812,797,000 | 0 |
Promacta |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Revenue |  | 14,200,000 | $ 0 | $ 27,812,000 | $ 14,193,000 | $ 68,191,000 |
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 | $ 0 |  |  |  |  |

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