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Common Stock, Stock Options and Warrants (Tables)
3 Months Ended
Dec. 31, 2019
Stockholders' Equity Note [Abstract]  
Schedule of stock option activity

   Option
Shares
   Weighted-
Average
Exercise
Price
   Weighted-
Average
Remaining
Contractual
Term
  Aggregate
Intrinsic
Value
 
Outstanding at October 1, 2019   1,771,039   $4.03         
Granted   980,799    0.67         
Exercised                
Forfeited or expired                
Outstanding at December 31, 2019   2,751,838   $2.831   8.3 years  $416,892 
Exercisable at December 31, 2019   1,199,509   $5.18   6.9 years  $67,461 

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    2,668   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 Placement 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 Placement 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 Underwriter Warrants   1.12    547,486   September 27, 2024
         24,416,845    

Summary of common stock reserved for future issuances

Stock plan options outstanding   2,751,838 
Stock plan shares available for future grants   110,000 
Warrants outstanding   24,416,845 
Unit purchase options outstanding   201,334 
Total   27,480,017