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Common Stock, Stock Options and Warrants (Tables)

12 Months Ended

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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Summary of common stock reserved for future issuances.

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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.

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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.

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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.

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