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License agreements - MacroGenics (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
License agreements          
Research and development   $ 298,089 $ 201,786 $ 601,192 $ 609,706
MacroGenics          
License agreements          
Upfront payment under license agreement $ 150,000        
Research and development   10,900   17,400  
MacroGenics | Accrued and other liabilities          
License agreements          
Accrued and other liabilities $ 1,100 $ 17,500   $ 17,500  
Minimum | MacroGenics          
License agreements          
Royalty payments on future global net sales (as a percent) 15.00%        
Maximum | MacroGenics          
License agreements          
Royalty payments on future global net sales (as a percent) 24.00%        
Development and Regulatory Milestones | Maximum | MacroGenics          
License agreements          
Additional milestone payments under the license agreement $ 420,000        
Commercialization Milestones | Minimum | MacroGenics          
License agreements          
Additional milestone payments under the license agreement $ 330,000