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License agreements - Agenus (Details)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 12 Months Ended
Feb. 14, 2017
USD ($)
$ / shares
Feb. 01, 2017
USD ($)
$ / shares
shares
Feb. 18, 2015
USD ($)
Feb. 28, 2017
USD ($)
item
Nov. 30, 2015
item
Feb. 28, 2015
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
License agreements                  
Long term investment             $ 134,356 $ 31,987  
Research and development expense             1,326,361 581,861 $ 479,514
Unrealized loss on long term investments             (24,275) (3,261) (4,581)
Agenus                  
License agreements                  
Research and development expense             $ 19,500 17,500 14,400
Number of program targets | item       4 3        
Royalty payments on future global net sales (as a percent)             15.00%    
Agenus | Accrued and other liabilities                  
License agreements                  
Accrued and other liabilities             $ 3,200 11,400  
Agenus | Development, Regulatory and Commercialization Milestones | Minimum                  
License agreements                  
Royalty payments on future global net sales (as a percent)             6.00%    
Agenus | Development, Regulatory and Commercialization Milestones | Maximum                  
License agreements                  
Royalty payments on future global net sales (as a percent)             12.00%    
Additional milestone payments under the license agreement       $ 510,000          
Agenus | Development Milestones                  
License agreements                  
Upfront payment under license agreement             $ 20,000    
Agenus                  
License agreements                  
Long term investment             $ 57,900 32,000  
Shares owned following stock purchase (as a percent)       11.00%   9.00%      
Ownership percentage (as a percent)             18.00%    
Unrealized loss on long term investments             $ (13,600) $ (3,300) (4,600)
Agenus | Stock purchase agreement                  
License agreements                  
Total consideration paid $ 60,000   $ 60,000            
Long term investment             39,500   39,800
Research and development expense             $ 20,500   $ 20,200
Purchase of common stock under Stock Purchase Agreement (in shares ) | shares   10.0              
Purchase price of common stock   $ 60,000              
Per share price | $ / shares $ 4.40 $ 6.00              
Discount for lack of marketability $ 4,500                
Fair value of shares on the issuance date $ 39,500