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Reverse Merger, Pro Forma Financial Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Pro Forma Financial Information [Abstract]        
Pro forma operating expenses $ 15,964,969 $ 5,162,697 $ 25,171,754 $ 39,067,927
Pro forma net loss $ (16,552,729) $ (4,976,379) $ (13,621,882) $ (39,799,838)
Pro forma basic net loss per share (in dollars per share) $ (3.15) $ (1.01) $ (2.88) $ (8.28)
Pro forma diluted net loss per share (in dollars per share) $ (3.15) $ (1.01) $ (2.88) $ (8.28)