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Subsequent Event - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 02, 2019
USD ($)
product
target
Jan. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Subsequent Event [Line Items]          
Upfront and milestone payments paid     $ 0 $ 85,000 $ 23,750
Milestone payment not yet paid     $ 226,616 $ 198,442 $ 162,297
Codiak Biosciences Inc | Subsequent Event          
Subsequent Event [Line Items]          
Number of targets | target 5        
Number of projects subject to right to co-commercialize | product 2        
Upfront Payment | Codiak Biosciences Inc | Subsequent Event          
Subsequent Event [Line Items]          
Upfront and milestone payments paid   $ 56,000      
Forecast | Preclinical Development Milestone Payment | Codiak Biosciences Inc | Subsequent Event          
Subsequent Event [Line Items]          
Milestone payment not yet paid $ 20,000        
Forecast | Milestone Payment | Codiak Biosciences Inc | Subsequent Event          
Subsequent Event [Line Items]          
Milestone payment not yet paid $ 200,000