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Common Stock, Stock Options and Warrants (Details) - USD ($)
 1 Months Ended 3 Months Ended
Nov. 02, 2021
Nov. 01, 2021
Oct. 11, 2021
Oct. 06, 2020
Feb. 19, 2021
Jan. 27, 2021
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Jun. 21, 2021
May 24, 2021
Nov. 05, 2020
Sep. 30, 2020
Sep. 11, 2020
Feb. 10, 2020
Feb. 07, 2018
Common Stock, Stock Options and Warrants (Details) [Line Items]                                
Common shares authorized             400,000,000   400,000,000              
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.                    
Common shares reserved                       2,000,000        
Remaining shares                           7,500,000    
Shares available for future grants             4,265,000                  
Issued shares of purchase   200,000 175,000 125,000                        
Share price (in Dollars per share)   $ 1.87 $ 2.04 $ 1.01     $ 1.72                  
Options vest over terms             10 years 10 years                
Share issued price per share               0.87                
Stock-based compensation expense description             Stock-based compensation expense for the three months ended December 31, 2021 and 2020 was $904,604 (including $33,333 for the NoveCite Stock Plan) and $276,582 (including $12,556 for the NoveCite Stock Plan), respectively.                   
Citius stock plans (in Dollars)             $ 7,755,214                  
Weighted average period term             2 years 4 months 24 days                  
Common shares outstanding             2,000,000                  
Stock option plan , description             NoveCite has options outstanding to purchase 2,000,000 common shares at a weighted average exercise price of $0.24 per share, of which 376,665 are exercisable as of December 31, 2021. 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 9.14 years. At December 31, 2021, unrecognized total compensation cost related to unvested awards under the NoveCite Stock Plan of $283,111 is expected to be recognized over a weighted average period of 2.17 years.                  
Board of Directors [Member]                                
Common Stock, Stock Options and Warrants (Details) [Line Items]                                
Issued shares of purchase     2,515,000 800,000                        
Registered Direct Offering [Member]                                
Common Stock, Stock Options and Warrants (Details) [Line Items]                                
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.                      
2014 Stock Incentive Plan [Member]                                
Common Stock, Stock Options and Warrants (Details) [Line Items]                                
Common stock for issuance             866,667                  
Shares outstanding             855,171                  
2018 Omnibus Stock Incentive Plan [Member]                                
Common Stock, Stock Options and Warrants (Details) [Line Items]                                
Common stock for issuance                               2,000,000
Number of shares outstanding             1,820,000                  
2020 Stock 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]                                
Option to purchase share outstanding             1,870,000                  
Remaining shares             1,240,000                  
2021 Stock Plan [Member]                                
Common Stock, Stock Options and Warrants (Details) [Line Items]                                
Common shares reserved                     8,740,000          
Option to purchase share outstanding             4,475,000                  
Shares available for future grants             4,265,000                  
Stock Options [Member]                                
Common Stock, Stock Options and Warrants (Details) [Line Items]                                
Contractual term             10 years                  
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            
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            
Common Stock [Member]                                
Common Stock, Stock Options and Warrants (Details) [Line Items]                                
Issued shares 50,201                              
Fair value of common stock (in Dollars) $ 95,884                              
Shares outstanding             146,029,630 55,576,996 145,979,429       55,576,996      
Issued shares of purchase     375,000 175,000                        
Warrants [Member]                                
Common Stock, Stock Options and Warrants (Details) [Line Items]                                
Weighted average remaining life of the outstanding warrants             3 years 6 months                  
Aggregate intrinsic value for the warrants outstanding (in Dollars)             $ 5,890,469