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Unaudited Statements of Stockholders' Equity - USD ($)
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Total
Balance at Dec. 31, 2017 $ 34,358 $ 271,944,173 $ (152,277,106) $ 119,701,425
Balance, shares at Dec. 31, 2017 34,359,799      
Issuance of common stock, net of issuance costs $ 8,050 128,417,030   128,425,080
Issuance of common stock, net of issuance costs, shares 8,050,000      
Exercise of options and warrants $ 728 897,832   898,560
Exercise of options and warrants, shares 727,428      
Stock-based compensation   3,437,341   3,437,341
Net loss     (34,366,718) (34,366,718)
Balance at Sep. 30, 2018 $ 43,136 404,696,376 (186,643,824) 218,095,688
Balance, shares at Sep. 30, 2018 43,137,227      
Balance at Jun. 30, 2018 $ 43,054 403,020,562 (175,068,713) 227,994,903
Balance, shares at Jun. 30, 2018 43,055,424      
Exercise of options and warrants $ 82 504,691   504,773
Exercise of options and warrants, shares 81,803      
Stock-based compensation   1,171,123   1,171,123
Net loss     (11,575,111) (11,575,111)
Balance at Sep. 30, 2018 $ 43,136 404,696,376 (186,643,824) 218,095,688
Balance, shares at Sep. 30, 2018 43,137,227      
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