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Common Stock, Stock Options and Warrants (Tables) | 12 Months Ended
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Sep. 30, 2020
Stockholders' Equity Note [Abstract] |
Schedule of fair value of stock option grants |
|  | 2020 |  | 2019 |
Risk-free interest rate |  | 0.26 – 1.66% |  | 2.18 – 2.53% |
Expected dividend yield |  | 0% |  | 0% |
Expected term |  | 6.50 – 10 years |  | 6.50 – 10 years |
Expected volatility |  | 107 – 117% |  | 119 – 121% |
Schedule of stock option activity |
|  | Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
Outstanding at September 30, 2019 |  |  | 1,771,039 |  |  | $ | 4.03 |  |  |  |  |  |  |  |
Granted |  |  | 1,625,799 |  |  |  | 0.89 |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (6,667 | ) |  |  | 9.00 |  |  |  |  |  |  |  |
Outstanding at September 30, 2020 |  |  | 3,390,171 |  |  | $ | 2.51 |  |  | 8.00 years |  |  | $ | 440,336 |
Exercisable at September 30, 2020 |  |  | 1,507,141 |  |  | $ | 4.44 |  |  | 6.56 years |  |  | $ | 72,566 |
Schedule of warrants outstanding |
|  | Exercise price |  |  | Number |  |  | Expiration Dates |
Investor Warrants |  | $ | 9.00 |  |  |  | 307,778 |  |  | November 5, 2020 – April 25, 2021 |
LMB Warrants |  |  | 6.15 |  |  |  | 38,771 |  |  | November 20, 2020 – March 2, 2021 |
LMB Warrants |  |  | 7.50 |  |  |  | 38,673 |  |  | November 2, 2020 – March 14, 2021 |
LMB Warrants |  |  | 7.50 |  |  |  | 53,110 |  |  | March 24, 2022 – April 29, 2022 |
Financial Advisor Warrants |  |  | 3.00 |  |  |  | 25,833 |  |  | August 15, 2021 |
2016 Offering Warrants |  |  | 4.13 |  |  |  | 140,819 |  |  | November 23, 2021 – February 27, 2022 |
2017 Public Offering Warrants |  |  | 4.13 |  |  |  | 1,622,989 |  |  | August 2, 2022 |
2017 Public Offering Underwriter Warrants |  |  | 4.54 |  |  |  | 65,940 |  |  | February 2, 2023 |
December 2017 Registered Direct/Private Placement Offering Investor Warrants |  |  | 4.63 |  |  |  | 640,180 |  |  | June 19, 2023 |
December 2017 Registered Direct/Private Placement Offering Agent Warrants |  |  | 5.87 |  |  |  | 89,625 |  |  | December 19, 2022 |
March 2018 Registered Direct/Private Placement Offering Investor Warrants |  |  | 2.86 |  |  |  | 218,972 |  |  | October 2, 2023 |
March 2018 Registered Direct/Private Placement Offering Agent Warrants |  |  | 3.73 |  |  |  | 46,866 |  |  | March 28, 2023 |
August 2018 Offering Investor Warrants |  |  | 1.15 |  |  |  | 7,843,138 |  |  | August 14, 2023 |
August 2018 Offering Agent Warrants |  |  | 1.59 |  |  |  | 549,020 |  |  | August 8, 2023 |
April 2019 Registered Direct/Private Placement Offering Investor Warrants |  |  | 1.42 |  |  |  | 1,294,498 |  |  | April 5, 2021 |
April 2019 Registered Direct/Private Placement Offering Placement Agent Warrants |  |  | 1.93 |  |  |  | 240,130 |  |  | April 5, 2021 |
September 2019 Offering Investor Warrants |  |  | 0.77 |  |  |  | 2,793,297 |  |  | September 27, 2024 |
September 2019 Offering Underwriter Warrants |  |  | 1.12 |  |  |  | 547,486 |  |  | September 27, 2024 |
February 2020 Exercise Agreement Warrants |  |  | 1.02 |  |  |  | 6,298,673 |  |  | August 19, 2025 |
February 2020 Exercise Agreement Placement Agent Warrants |  |  | 1.28 |  |  |  | 440,907 |  |  | August 19,2025 |
May 2020 Registered Direct Offering Investor Warrants |  |  | 1.00 |  |  |  | 2,400,000 |  |  | November 18, 2025 |
May 2020 Registered Direct Offering Placement Agent Warrants |  |  | 1.33 |  |  |  | 494,118 |  |  | May 14, 2025 |
August 2020 Underwriter Warrants |  |  | 1.31 |  |  |  | 641,166 |  |  | August 10, 2025 |
|  |  |  |  |  |  | 26,831,989 |  |  |  |
Summary of common stock reserved for future issuances |
Stock plan options outstanding |  |  | 3,390,171 |
Stock plan shares available for future grants |  |  | 2,465,000 |
Warrants outstanding |  |  | 26,831,989 |
Total |  |  | 32,687,160 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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