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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      
Net loss       (11,278,763)
Balance at Mar. 31, 2018 $ 42,489 401,786,661 (163,789,950) 238,039,200
Balance, shares at Mar. 31, 2018 42,490,110      
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 $ 646 393,140   393,786
Exercise of options and warrants, shares 645,625      
Stock-based compensation   2,266,219   2,266,219
Net loss     (22,791,607) (22,791,607)
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      
Balance at Mar. 31, 2018 $ 42,489 401,786,661 (163,789,950) 238,039,200
Balance, shares at Mar. 31, 2018 42,490,110      
Issuance of common stock, net of issuance costs   (10,920)   (10,920)
Exercise of options and warrants $ 565 94,432   94,997
Exercise of options and warrants, shares 565,314      
Stock-based compensation   1,150,389   1,150,389
Net loss     (11,278,763) (11,278,763)
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      
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      
Net loss       (15,829,815)
Balance at Mar. 31, 2019 $ 43,179 407,385,052 (214,634,636) 192,793,595
Balance, shares at Mar. 31, 2019 43,180,169      
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 $ 33 106,288   106,321
Exercise of options, shares 32,439      
Stock-based compensation   2,901,839   2,901,839
Net loss     (29,913,712) (29,913,712)
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      
Balance at Mar. 31, 2019 $ 43,179 407,385,052 (214,634,636) 192,793,595
Balance, shares at Mar. 31, 2019 43,180,169      
Exercise of options $ 13 75,755   75,768
Exercise of options, shares 13,021      
Stock-based compensation   1,519,395   1,519,395
Net loss     (15,829,815) (15,829,815)
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