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Common Stock, Stock Options and Warrants (Details) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 12, 2021
Sep. 08, 2020
Aug. 10, 2020
Jun. 26, 2020
Apr. 06, 2020
Feb. 10, 2020
Jan. 31, 2020
Dec. 31, 2019
Nov. 04, 2019
Feb. 19, 2021
Jan. 27, 2021
May 18, 2020
Feb. 14, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 21, 2021
May 24, 2021
Apr. 30, 2021
Nov. 05, 2020
Feb. 07, 2018
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Common shares authorized                           400,000,000 400,000,000          
Common stock, shares issued 50,000 101,174     50,000 150,000     186,566                      
Fair value of common stock issued (in Dollars) $ 68,000 $ 100,000     $ 22,750 $ 306,020     $ 100,000                      
Common stock for general advisory and business development advisory services           136,000                            
Common shares reserved                                     2,000,000  
Shares available for future grants                           7,530,000            
Weighted average grant date fair value (in Dollars per share)                           $ 1.34 $ 0.76          
Options vest over terms                           10 years 10 years          
Stock-based compensation expense description                           Stock-based compensation expense for the years ended September 30, 2021 and 2020 was $1,454,979 (including $83,555 for the NoveCite Stock Plan) and $803,261, respectively.             
Citius stock plans (in Dollars)                           $ 3,012,685            
Weighted average period term                           2 years 4 months 2 days            
Common shares outstanding                           2,000,000            
Stock option purchase grants                           2,000,000            
Weighted average exercise price (in Dollars per share)                           $ 0.24            
Weighted average grant date fair value description                           The weighted average grant date fair value of the options granted during the year ended September 30, 2021 was estimated at $0.20 per share. All of these options vest over 36 months and have a term of 10 years. The weighted average remaining contractual term of options outstanding under the NoveCite Stock Plan is 9.39 years. At September 30, 2021, unrecognized total compensation cost related to unvested awards under the NoveCite Stock Plan of $316,445 is expected to be recognized over a weighted average period of 2.42 years.            
Warrants were exercised (in Dollars per share)       $ 1                                
Net proceeds (in Dollars)       $ 1,129,412                                
Warrant exercise agreement description                         the Company entered into a warrant exercise agreement for an aggregate of 3,712,218 shares of common stock having an existing exercise price of $0.77 and 2,586,455 shares of common stock at a reduced exercise price of $1.02. In consideration for the exercise of the warrants for cash, the exercising holders received new unregistered warrants to purchase 6,298,673 shares of common stock at an exercise price of $1.02 per share, exercisable six months after issuance and which have a term of exercise equal to five years. The offering closed on February 19, 2020 and net proceeds were $5,013,930 after placement agent fees and offering expenses. The Company also issued warrants to purchase 440,907 shares to the placement agent. The placement agent warrants have identical terms to the investor warrants except that the exercise price is $1.275 per share. The estimated fair value of the 6,298,673 warrants issued to the investors was $5,360,465 and the estimated fair value of the 440,907 warrants issued to the placement agent was $367,022.              
Extended term                                   3 years    
Extented date                                   Apr. 05, 2024    
Warrants for common stock                           145,979,429 55,576,996     1,294,498    
Common stock exercise price per share (in Dollars per share)                                   $ 1.42    
Warrants shares                                   240,130    
Warrants exercise price per share (in Dollars per share)                                   $ 1.93    
Fair value of deemed dividend (in Dollars)                           $ 1,450,876            
Proceeds from exercise of common stock warrants (in Dollars)                           $ 31,130,134            
Registered Direct Offering [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Description of warrants                       the Company closed a registered direct offering with several institutional and accredited investors for the sale of 7,058,824 shares of common stock at $1.0625 per share for gross proceeds of $7,500,001. The Company also issued 3,529,412 unregistered immediately exercisable warrants to the investors with an exercise price of $1.00 per share and a term of five and one-half years. The Company paid the placement agent for the offering a fee of 7% of the gross proceeds totaling $525,000 and issued the placement agent 494,118 immediately exercisable warrants with an exercise price of $1.3281 per share and a term of five years. The Company also reimbursed the placement agent for $85,000 in expenses and incurred $12,901 in other expenses. Net proceeds from the offering were $6,877,100. The estimated fair value of the 3,529,412 warrants issued to the investors was $2,138,998 and the estimated fair value of the 494,118 warrants issued to the placement agent was $275,724.                
Common stock offerings, description                   the Company closed a registered direct offering for 50,830,566 common shares and warrants to purchase up to 25,415,283 common shares, at a purchase price of $1.505 per share of common stock and accompanying warrant, for gross proceeds of $76,500,002. The 25,415,283 warrants are immediately exercisable at $1.70 per common share for a term of five years. The Company paid the placement agent a fee of 7% of the gross proceeds totaling $5,355,000 and issued the placement agent 3,558,140 immediately exercisable warrants at $1.881 per common share for a term of five years. The Company also reimbursed the placement agent for $85,000 in expenses and incurred $80,160 in other expenses. Net proceeds from the offering were $70,979,842. The estimated fair value of the 25,415,283 warrants issued to the investors was approximately $42,322,000 and the estimated fair value of the 3,558,140 warrants issued to the placement agent was approximately $5,850,000.                    
Underwritten Public Offering [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Description of warrants     the Company closed an underwritten public offering of 9,159,524 shares of common stock at a price of $1.05 per share for gross proceeds of $9,617,500. The Company paid the underwriter a fee of 7% of the gross proceeds totaling $673,225 and issued the underwriters 641,166 immediately exercisable warrants with an exercise price of $1.3125 per share and a term of five years. The Company also reimbursed the placement agent for $135,000 in expenses and incurred $109,074 in other expenses. Net proceeds from the offering were $8,700,201. The estimated fair value of the 641,166 warrants issued to the underwriter was $569,426.                                  
2014 Stock Incentive Plan [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Common stock for issuance                           866,667            
Shares outstanding                           855,171            
Purchase of shares were exercised                           4,829            
Options to purchase shares expired                           6,667            
2018 Omnibus Stock Incentive Plan [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Common stock for issuance                                       2,000,000
2020 Omnibus Stock Incentive Plan [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Purchase of shares were exercised                           70,000            
Number of shares outstanding                           1,820,000            
Remaining shares                           110,000            
2020 Plan [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Common shares reserved           3,110,000                            
2021 Omnibus Stock Incentive Plan [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Remaining shares                           1,240,000            
Option to purchase share outstanding                           1,870,000            
2021 Stock Plan [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Common shares reserved                                 8,740,000      
Option to purchase share outstanding                           1,210,000            
Shares available for future grants                           7,530,000            
Stock Options [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Contractual term                           10 years            
September 2019 Offering Pre-Funded [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Warrants shares               1,060,615                        
Warrants were exercised (in Dollars per share)               $ 0.0001                        
Net proceeds (in Dollars)               $ 106                        
September 2019 Offering Investor [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Warrants shares             1,315,715                          
Warrants were exercised (in Dollars per share)             $ 0.77                          
Net proceeds (in Dollars)             $ 1,013,101                          
May 2020 Registered Direct Offering [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Warrants shares       1,129,412                                
Minimum [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Shares of capital stock authorized                               210,000,000        
Common shares authorized                               200,000,000        
Options vest over terms                           12 months 12 months          
Maximum [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Shares of capital stock authorized                               410,000,000        
Common shares authorized                               400,000,000        
Options vest over terms                           36 months 36 months          
Warrants [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Common shares reserved                           40,208,347            
Weighted average remaining life of the outstanding warrants                           3 years 8 months 26 days            
Aggregate intrinsic value for the warrants outstanding (in Dollars)                           $ 19,903,185            
Private Placement [Member]                                        
Common Stock, Stock Options and Warrants (Details) [Line Items]                                        
Common stock offerings, description                     the Company closed a private placement for 15,455,960 common shares and warrants to purchase 7,727,980 common shares, at a purchase price of $1.294 per common share and accompanying warrant, for gross proceeds of $20,000,012. The 7,727,980 warrants are immediately exercisable at $1.231 per common share for a term of five and one-half years. The Company paid the placement agent a fee of 7% of the gross proceeds totaling $1,400,001 and issued the placement agent 1,081,917 immediately exercisable warrants at $1.6175 per common share for a term of five and one-half years. The Company also reimbursed the placement agent for $85,000 in expenses and incurred $64,601 in other expenses. Net proceeds from the offering were $18,450,410. The estimated fair value of the 7,727,980 warrants issued to the investors was approximately $7,582,000 and the estimated fair value of the 1,081,917 warrants issued to the placement agent was approximately $1,025,000.