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Common Stock, Stock Options and Warrants (Tables)
12 Months Ended
Sep. 30, 2023
Common Stock, Stock Options and Warrants [Abstract]  
Schedule of Fair Value of Stock Option Grants The following assumptions were used in determining the fair value of stock option grants for the years ended September 30, 2023 and 2022:
   2023   2022 
Risk-free interest rate   3.52 – 4.14%    1.05 – 2.94% 
Expected dividend yield   0.00%   0.00%
Expected term   5.50 – 10 years    6.50 – 10 years 
Expected volatility   89 – 90%   94 – 110%
Schedule of Option Activity Under the Plans A summary of option activity under the Citius Pharma plans (excluding the NoveCite and Citius Oncology Stock Plans) is presented below:
   Option
Shares
   Weighted-
Average
Exercise
Price
   Weighted-
Average
Remaining
Contractual
Term
  Aggregate
Intrinsic
Value
 
Outstanding at September 30, 2022   9,400,171   $2.07   7.81 years  $869,509 
Granted   4,150,000    1.26         
Exercised   (46,667)   0.67       34,067 
Forfeited or expired   (198,333)   3.91         
Outstanding at September 30, 2023   13,305,171   $1.79   7.41 years  $56,203 
                   
Exercisable at September 30, 2023   6,558,507   $2.09   6.19 years  $56,203 
Schedule of Warrants Outstanding The following table summarizes the warrants outstanding at September 30, 2023:
   Exercise
price
   Number   Expiration Dates
March 2018 Registered Direct/Private Placement Investors  $2.86    218,972   October 2, 2023
August 2018 Offering Investors   1.15    3,921,569   August 14, 2024
August 2018 Offering Agent   1.59    189,412   August 8, 2024
April 2019 Registered Direct/Private Placement Investors   1.42    1,294,498   April 5, 2024
April 2019 Registered Direct/Private Placement Agent   1.93    240,130   April 5, 2024
September 2019 Offering Investors   0.77    2,793,297   September 27, 2024
September 2019 Offering Underwriter   1.12    194,358   September 27, 2024
February 2020 Exercise Agreement Placement Agent   1.28    138,886   August 19, 2025
May 2020 Registered Direct Offering Investors   1.00    1,670,588   November 18, 2025
May 2020 Registered Direct Offering Placement Agent   1.33    155,647   May 14, 2025
August 2020 Underwriter   1.31    201,967   August 10, 2025
January 2021 Registered Direct Offering Investors   1.23    3,091,192   July 27, 2026
January 2021 Registered Direct Offering Agent   1.62    351,623   July 27, 2026
February 2021 Offering Investors   1.70    20,580,283   February 19, 2026
February 2021 Offering Agent   1.88    2,506,396   February 19, 2026
May 2023 Registered Direct Offering Investors   1.50    12,500,001   May 8, 2028
May 2023 Registered Direct Offering Agent   1.50    875,000   May 3, 2028
         50,923,819    
Schedule of Common Stock Reserved for Future Issuances A summary of common stock reserved for future issuances as of September 30, 2023 is as follows:
Stock plan options outstanding   13,305,171 
Stock plan shares available for future grants   11,735,000 
Warrants outstanding   50,923,819 
Total   75,963,990