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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