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STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit
--- | --- | --- | --- | ---
Balance, shares at Sep. 30, 2018 |  | 28,034,487 |  |
Balance, amount at Sep. 30, 2018 | $ 916 | $ 280,346 | $ 331,312,184 | $ (331,591,614)
Warrant exercises, shares |  | 6,677,519 |  |
Warrant exercises, amount | 18,106,617 | $ 66,775 | 18,039,842 | 0
401(k) contributions paid in common stock, shares |  | 30,996 |  |
401(k) contributions paid in common stock, amount | $ 143,878 | $ 310 | 143,568 | 0
Stock issued to nonemployees for service, shares | 199,977 | 199,977 |  |
Stock issued to nonemployees for service, amount | $ 878,588 | $ 1,999 | 876,589 | 0
Equity based compensation - employees, shares |  | (7,500) |  |
Equity based compensation - employees, amount | 4,428,174 | $ (75) | 4,428,249 | 0
Stock option exercises, shares |  | 65,997 |  |
Stock option exercises, amount | 150,482 | $ 660 | 149,822 | 0
Purchase of stock by officers and directors, shares |  | 45,205 |  |
Purchase of stock by officers and directors, amount | 291,997 | $ 452 | 291,545 | 0
Stock issuance costs | (132,345) | $ 0 | (132,345) | 0
Shares issued for settlement of clinical research costs, shares |  | 185,095 |  |
Shares issued for settlement of clinical research costs, amount | 3,400,000 | $ 1,851 | 3,398,149 | 0
Net loss | (22,134,640) | $ 0 | 0 | (22,134,640)
Balance, shares at Sep. 30, 2019 |  | 35,231,776 |  |
Balance, amount at Sep. 30, 2019 | 5,133,667 | $ 352,318 | 358,507,603 | (353,726,254)
Warrant exercises, shares |  | 1,711,873 |  |
Warrant exercises, amount | 15,144,240 | $ 17,118 | 15,127,122 | 0
401(k) contributions paid in common stock, shares |  | 13,870 |  |
401(k) contributions paid in common stock, amount | $ 163,340 | $ 139 | 163,201 | 0
Stock issued to nonemployees for service, shares | 79,950 | 79,950 |  |
Stock issued to nonemployees for service, amount | $ 972,667 | $ 799 | 971,868 | 0
Equity based compensation - employees, amount | 10,112,968 | $ 0 | 10,112,968 | 0
Stock option exercises, shares |  | 99,740 |  |
Stock option exercises, amount | 338,328 | $ 998 | 337,330 | 0
Purchase of stock by officers and directors, shares |  | 20,512 |  |
Purchase of stock by officers and directors, amount | 184,990 | $ 205 | 184,785 | 0
Stock issuance costs | (787,723) | $ 0 | (787,723) | 0
Shares issued for settlement of clinical research costs, shares |  | 150,000 |  |
Shares issued for settlement of clinical research costs, amount | 1,769,500 | $ 1,500 | 1,768,000 | 0
Net loss | (30,255,244) | $ 0 | 0 | (30,255,244)
Adoption of new accounting principle (ASC 842) | 2,146,195 |  |  | 2,146,195
Proceeds from the sale of common stock, shares |  | 1,422,429 |  |
Proceeds from the sale of common stock, amount | 13,992,439 | $ 14,225 | 13,978,214 | 0
Warrant issuances | 805,753 | 0 | 805,753 | 0
Modification of warrants | 5,554 | $ 0 | 5,554 | 0
Balance, shares at Sep. 30, 2020 |  | 38,730,150 |  |
Balance, amount at Sep. 30, 2020 | $ 19,726,674 | $ 387,302 | $ 401,174,675 | $ (381,835,303)

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