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Unaudited Statements of Stockholders' Equity - USD ($)
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Total
Balance at Dec. 31, 2018 $ 43,159 $ 405,972,075 $ (200,550,739) $ 205,464,495
Balance, shares at Dec. 31, 2018 43,160,751      
Exercise of options $ 199 292,892   293,091
Exercise of options, shares 199,198      
Stock-based compensation   4,488,985   4,488,985
Net loss     (43,165,594) (43,165,594)
Balance at Sep. 30, 2019 $ 43,358 410,753,952 (243,716,333) 167,080,977
Balance, shares at Sep. 30, 2019 43,359,949      
Balance at Jun. 30, 2019 $ 43,192 408,980,202 (230,464,451) 178,558,943
Balance, shares at Jun. 30, 2019 43,193,190      
Exercise of options $ 166 186,603   186,769
Exercise of options, shares 166,759      
Stock-based compensation   1,587,147   1,587,147
Net loss     (13,251,882) (13,251,882)
Balance at Sep. 30, 2019 $ 43,358 410,753,952 (243,716,333) 167,080,977
Balance, shares at Sep. 30, 2019 43,359,949      
Balance at Dec. 31, 2019 $ 43,465 412,599,772 (258,442,650) 154,200,587
Balance, shares at Dec. 31, 2019 43,466,933      
Issuance of common stock, net of issuance costs $ 4,139 14,115,414   14,119,553
Issuance of common stock, net of issuance costs, shares 4,136,742      
Exercise of options and vesting of restricted stock units $ 225 135,358   135,583
Exercise of options and vesting of restricted stock units, shares 225,156      
Stock-based compensation   5,274,173   5,274,173
Net loss     (35,464,168) (35,464,168)
Balance at Sep. 30, 2020 $ 47,829 432,124,717 (293,906,818) 138,265,728
Balance, shares at Sep. 30, 2020 47,828,831      
Balance at Jun. 30, 2020 $ 46,713 425,890,066 (280,184,283) 145,752,496
Balance, shares at Jun. 30, 2020 46,714,698      
Issuance of common stock, net of issuance costs $ 1,012 4,544,404   4,545,416
Issuance of common stock, net of issuance costs, shares 1,010,033      
Exercise of options and vesting of restricted stock units $ 104 (104)    
Exercise of options and vesting of restricted stock units, shares 104,100      
Stock-based compensation   1,690,351   1,690,351
Net loss     (13,722,535) (13,722,535)
Balance at Sep. 30, 2020 $ 47,829 $ 432,124,717 $ (293,906,818) $ 138,265,728
Balance, shares at Sep. 30, 2020 47,828,831