Annual report pursuant to Section 13 and 15(d)

Sale of Vernalis R&D and Promacta License - Narrative (Details)

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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