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Revenue Recognition - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Total revenues $ 279,488 $ 866,863 $ 135,673 $ 2,829,905 $ 2,502,624 $ 2,000,868 $ 24,448,761 $ 1,529,644 $ 4,111,930 $ 30,481,897 $ 42,220,086
Revenue recognized from deferred revenue beginning balance                 293,000 $ 1,300,000  
AstraZeneca                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 3,200,000    
Other Counterparty                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 $ 917,000