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Revenue Recognition (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Total revenues $ 866,863 $ 2,000,868 $ 3,832,442 $ 27,979,273
Revenue recognized from deferred revenue beginning balance 41,000 316,000 256,000 1,300,000
AstraZeneca        
Disaggregation of Revenue [Line Items]        
Total revenues 255,000 $ 1,800,000 3,000,000 $ 4,500,000
Other Counterparty        
Disaggregation of Revenue [Line Items]        
Total revenues $ 612,000   $ 803,000