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Common Stock, Stock Options and Warrants (Tables)
12 Months Ended
Sep. 30, 2019
Stockholders' Equity Note [Abstract]  
Schedule of assumptions used in fair value of stock option grants
   2019   2018    2017 
Risk-free interest rate   2.18 – 2.53%   2.78 – 2.99%    1.79 – 1.90%
Expected dividend yield   0%   0%    0%
Expected term   6.50 – 10 years    6.50 – 10 years     6.50 – 10 years 
Expected volatility   119 – 121%   116%    85 – 108%
Schedule of stock option activity

   Shares   Weighted-
Average
Exercise
Price
   Weighted-
Average
Remaining
Contractual
Term
  Aggregate
Intrinsic
Value
 
Outstanding at September 30, 2018   1,601,039   $4.35         
Granted   190,000    1.04         
Exercised                
Forfeited or expired   (20,000)   0.94         
Outstanding at September 30, 2019   1,771,039   $4.03   7.75 years  $49,465 
Exercisable at September 30, 2019   1,174,019   $5.24   7.11 years  $49,465 

Schedule of warrants outstanding

   Exercise
price
   Number   Expiration Dates
Investor Warrants  $9.00    202,469   March 19, 2020 – September 14, 2020
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   9.90    4,985   January 8, 2020
LMB Warrants   20.70    17,721   November 3, 2019 – March 6, 2020
LMB Warrants   7.50    73,883   August 18, 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    669,504   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    3,430,421   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    7,821,230   September 27, 2024
September 2019 Offering Pre-Funded Unit Warrants   0.0001    1,060,615   No expiration date
September 2019 Offering Underwriter Warrants   1.12    547,486   September 27, 2024
              
         25,492,513    

Schedule of common stock reserved for future issuances

Stock plan options outstanding   1,771,039 
Stock plan shares available for future grants   1,090,799 
Warrants   25,492,513 
Unit purchase options   201,334 
Total   28,555,685