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Revenue Recognition (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Total revenues $ 135,673 $ 24,448,761 $ 2,965,579 $ 25,978,405
Revenue recognized from deferred revenue beginning balance 36,000 354,000 215,000 1,000,000
AstraZeneca        
Disaggregation of Revenue [Line Items]        
Total revenues 62,000 $ 1,400,000 2,800,000 $ 2,700,000
Other Counterparty        
Disaggregation of Revenue [Line Items]        
Total revenues $ 74,000   $ 191,000