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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue            
Accumulated Deficit $ (1,036,972)     $ (1,036,972)   $ (1,013,316)
Accounts receivable 329     329   1,015
Contract assets 0     0   0
Contract liability 303     303   $ 254
Revenue, contract liabilities 0     100    
Revenues 236   $ 715 2,965 $ 2,140  
Product Development and Licensing Agreements            
Revenue            
Revenues     195 2,285 325  
Contracts and Grants            
Revenue            
Revenues 236   520 680 1,815  
Rockefeller | Product Development and Licensing Agreements            
Revenue            
Revenue, contract liabilities   $ 1,800        
Rockefeller University and Duke University | Contracts and Grants            
Revenue            
Revenues $ 200   $ 400 $ 500 $ 1,500