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Statements of Operations and Comprehensive Loss - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statements of Operations and Comprehensive Loss        
Revenue $ 142 $ 1,055,582 $ 9,000,000
Costs and expenses:        
Research and development expense 10,167,282 9,870,813 21,314,517 22,539,073
General and administrative expense 4,237,342 4,234,917 8,425,452 8,674,677
Total costs and expenses 14,404,624 14,105,730 29,739,969 31,213,750
Loss from operations (14,404,482) (14,105,730) (28,684,387) (22,213,750)
Interest income 5,221 26,701 11,067 472,117
Net loss and comprehensive loss $ (14,399,261) $ (14,079,029) $ (28,673,320) $ (21,741,633)
Basic and diluted net loss per common share (in dollars per share) $ (0.28) $ (0.32) $ (0.56) $ (0.50)
Basic and diluted weighted-average number of common shares (in shares) 51,539,010 43,801,251 51,118,096 43,688,420