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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)

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