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Condensed Consolidated Statements of Operations - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Operating expenses:        
Research and development $ 11,597,633 $ 8,544,547 $ 30,052,432 $ 25,168,446
General and administrative 5,168,103 4,631,228 14,089,106 14,636,941
Total operating expenses 16,765,736 13,175,775 44,141,538 39,805,387
Loss from operations (16,765,736) (13,175,775) (44,141,538) (39,805,387)
Interest income 131,164 213,992 649,504 725,709
Net loss (16,634,572) (12,961,783) (43,492,034) (39,079,678)
Net loss attributable to common stockholders $ (16,634,572) $ (12,961,783) $ (43,492,034) $ (39,079,678)
Common Stock [Member]        
Operating expenses:        
Net loss per share, basic and diluted $ (0.43) $ (0.53) $ (1.21) $ (1.59)
Weighted-average shares outstanding basic and diluted 38,504,825 24,634,380 35,872,441 24,623,225