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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Revenue      
Accumulated Deficit $ (1,025,941)   $ (1,013,316)
Accounts receivable 1,108   1,015
Contract liability 199   $ 254
Revenue, contract liabilities 100    
Revenues 2,728 $ 1,425  
Product Development and Licensing Agreements      
Revenue      
Revenues 2,286 129  
Contracts and Grants      
Revenue      
Revenues 442 1,296  
Rockefeller | Product Development and Licensing Agreements      
Revenue      
Revenue, contract liabilities 1,800    
Rockefeller University and Duke University | Contracts and Grants      
Revenue      
Revenues $ 400 $ 1,200