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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Balance, shares at Dec. 31, 2018   46,353,068    
Balance, amount at Dec. 31, 2018 $ 19,770,438 $ 4,635 $ 236,203,041 $ (216,437,238)
Stock-based compensation 637,263 0 637,263 0
Warrants issued in connection with note payable 2,699,208 0 2,699,208 0
Net loss (13,067,955) $ 0 0 (13,067,955)
Balance, shares at Mar. 31, 2019   46,353,068    
Balance, amount at Mar. 31, 2019 10,038,954 $ 4,635 239,539,512 (229,505,193)
Balance, shares at Dec. 31, 2018   46,353,068    
Balance, amount at Dec. 31, 2018 19,770,438 $ 4,635 236,203,041 (216,437,238)
Net loss (26,279,827)      
Balance, shares at Jun. 30, 2019   59,317,806    
Balance, amount at Jun. 30, 2019 46,905,861 $ 5,932 289,616,994 (242,717,065)
Balance, shares at Mar. 31, 2019   46,353,068    
Balance, amount at Mar. 31, 2019 10,038,954 $ 4,635 239,539,512 (229,505,193)
Stock-based compensation 726,736 $ 0 726,736 0
Issuance of common stock, net of offering expenses, shares   12,937,500    
Warrants issued in connection with note payable 879,907 $ 0 879,907 0
Issuance of common stock, net of offering expenses, amount 48,397,088 1,294 48,395,794 0
Net loss (13,211,872) $ 0 0 (13,211,872)
Exercise of stock options, shares   27,238    
Exercise of stock options, amount 75,048 $ 3 75,045 0
Balance, shares at Jun. 30, 2019   59,317,806    
Balance, amount at Jun. 30, 2019 46,905,861 $ 5,932 289,616,994 (242,717,065)
Balance, shares at Dec. 31, 2019   59,318,355    
Balance, amount at Dec. 31, 2019 26,193,149 $ 5,932 290,903,772 (264,716,555)
Stock-based compensation 676,548 $ 0 676,548 0
Issuance of common stock, net of offering expenses, shares   27,025,000    
Issuance of common stock, net of offering expenses, amount 88,704,039 $ 2,703 88,701,336 0
Net loss (19,245,230) $ 0 0 (19,245,230)
Exercise of stock options, shares   1,958    
Exercise of stock options, amount 7,177 $ 0 7,177 0
Balance, shares at Mar. 31, 2020   86,345,313    
Balance, amount at Mar. 31, 2020 96,335,683 $ 8,635 380,288,833 (283,961,785)
Balance, shares at Dec. 31, 2019   59,318,355    
Balance, amount at Dec. 31, 2019 26,193,149 $ 5,932 290,903,772 (264,716,555)
Net loss (39,423,321)      
Balance, shares at Jun. 30, 2020   86,349,981    
Balance, amount at Jun. 30, 2020 76,879,455 $ 8,635 381,010,696 (304,139,876)
Balance, shares at Mar. 31, 2020   86,345,313    
Balance, amount at Mar. 31, 2020 96,335,683 $ 8,635 380,288,833 (283,961,785)
Stock-based compensation 715,608 0 715,608 0
Net loss (20,178,091) $ 0 0 (20,178,091)
Exercise of stock options, shares   4,668    
Exercise of stock options, amount 6,255 $ 0 6,255 0
Balance, shares at Jun. 30, 2020   86,349,981    
Balance, amount at Jun. 30, 2020 $ 76,879,455 $ 8,635 $ 381,010,696 $ (304,139,876)