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Patent and Technology License Agreements (Details) - USD ($)
 1 Months Ended 9 Months Ended
Oct. 06, 2020
Jan. 31, 2022
Jan. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2020
Patent and Technology License Agreements (Details) [Line Items]            
Annual maintenance fee expense       $ 90,000 $ 90,000  
Annual minimum royalty payment       100,000    
Increasing annual royalties       25,000    
Maximum aggregate annual royalties       150,000    
Payable amount to NAT       1,100,000    
Annual maintenance fee   $ 60,000 $ 45,000      
Research and development expense       $ 19,400,000    
Developmental milestone, description       NoveCite is obligated to pay Novellus up to an aggregate of $51,000,000 upon the achievement of various regulatory and developmental milestones. NoveCite also must pay a royalty equal to low double-digit percentages of net sales, commencing upon the sale of a licensed product. This royalty is subject to downward adjustment to an upper-single digit percentage of net sales in any country in the event of the expiration of the last valid patent claim or if no valid patent claim exists in that country. The royalty will end on the earlier of (i) the date on which a biosimilar product is first marketed, sold, or distributed in the applicable country or (ii) the 10-year anniversary of the date of expiration of the last-to-expire valid patent claim in that country. In the case of a country where no licensed patent ever exists, the royalty will end on the later of (i) the date of expiry of such licensed product’s regulatory exclusivity and (ii) the 10-year anniversary of the date of the first commercial sale of the licensed product in the applicable country. In addition, NoveCite will pay to Novellus an amount equal to a mid-twenties percentage of any sublicensee fees it receives.     
Revenue percentage       50.00%    
Description of license agreement       The term of the license agreement will continue until (i) if there has not been a commercial sale of a licensed product in the territory, until the 10-year anniversary of the original license effective date, March 30, 2016, or (ii) if there has been a first commercial sale of a licensed product in the territory within the 10-year anniversary of the original license effective date, the 10-year anniversary of the first commercial sale on a country-by-country basis. The term of the license may be extended for additional 10-year periods for all countries in the territory by notifying Eisai and paying an extension fee equal to $10 million.    
License agreement development, description       Under the license agreement, Eisai is to receive a $6.0 million development milestone payment upon initial approval and additional commercial milestone payments related to the achievement of net product sales thresholds (which increases to $7.0 million in the event we have exercised our option to add India to the licensed territory prior to FDA approval) and up to an aggregate of $22 million related to the achievement of net product sales thresholds. We also are required to reimburse Eisai for up to $2.65 million of its costs to complete the ongoing Phase 3 pivotal clinical trial for I/ONTAK for the CTCL indication and reimburse Eisai for all reasonable costs associated with the preparation of a BLA for I/ONTAK.    
NoveCite [Member]            
Patent and Technology License Agreements (Details) [Line Items]            
Research and development expense $ 5,000,000          
Outstanding equity           25.00%
Percentage of outstanding equity 75.00%          
Percentage of ownership additional shares 25.00%          
Patent and Technology [Member]            
Patent and Technology License Agreements (Details) [Line Items]            
Description of annual maintenance fee       The annual maintenance fee increases by $15,000 per year up to a maximum of $90,000. Annual maintenance fees cease on the first sale of product. We also must pay up to an aggregate of $2.1 million in milestone payments, contingent on the achievement of various regulatory and commercial milestones. Under the terms of the license agreement, we also must pay a royalty of mid- to upper-single digit percentages of net sales, depending on the amount of annual sales, and subject to downward adjustment to lower- to mid-single digit percentages in the event there is no valid patent for the product in the United States at the time of sale. After the first sale of product, we will owe an annual minimum royalty payment of $100,000 that will increase annually by $25,000 for the duration of the term.    
Eisai [Member]            
Patent and Technology License Agreements (Details) [Line Items]            
Description of license agreement       Citius paid a $40 million upfront payment which represents the acquisition date fair value of the in-process research and development acquired from Dr. Reddy’s. Dr. Reddy’s is entitled to up to an aggregate of $40 million in development milestone payments related to CTCL approvals in the U.S. and other markets, up to an aggregate of $70 million in development milestones for additional indications, as well as commercial milestone payments and low double-digit tiered royalties on net product sales, and up to an aggregate of $300 million for commercial sales milestones. We also must pay on a fiscal quarter basis tiered royalties equal to low double-digit percentages of net product sales. The royalties will end on the earlier of (i) the 15-year anniversary of the first commercial sale of the latest indication that received regulatory approval in the applicable country and (ii) the date on which a biosimilar product results in the reduction of net sales in the applicable product by 50% in two consecutive quarters, as compared to the four quarters prior to the first commercial sale of the biosimilar product.