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Notes Payable (Details Narrative) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 28, 2020
Jun. 27, 2018
Jun. 18, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Short-term Debt [Line Items]                
Interest and Debt Expense       $ 95,520 $ 450,732 $ 474,361 $ 1,130,699  
Debt Issuance Costs, Net       $ 191,226   $ 191,226    
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 0.01   $ 0.01    
Initial Horizon Credit Agreement Amendment [Member]                
Short-term Debt [Line Items]                
Amortization of Debt Issuance Costs         251,993 $ 139,428 444,786  
Interest Expense, Debt         $ 198,738 $ 225,920 $ 685,913  
Horizon Technology Finance Corporation [Member]                
Short-term Debt [Line Items]                
Long-term Line of Credit     $ 5,425,000          
SVB Loan Facility [Member]                
Short-term Debt [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity     10,000,000          
Proceeds from Lines of Credit     6,000,000          
Restricted cash     6,000,000.0          
Line of Credit Facility, Remaining Borrowing Capacity     $ 4,000,000          
Debt Instrument, Interest Rate, Stated Percentage     3.25%          
Final payment percentage     3.00%          
Long-term Line of Credit     $ 10,000,000          
Debt Instrument, Description     Payments under the loan agreement are interest only for the first 24 months after loan closing, followed by a 24-month amortization period of principal and interest through the scheduled maturity date.     Payments under the loan agreement are interest only (calculated based on one-month LIBOR plus 7.625%) for the first 24 months through July 2020, followed by a 21-month amortization period of principal and interest starting on August 1, 2020 and ending through the scheduled maturity date    
Interest and Debt Expense     $ 243,370          
End of term charge percentage     3.00%          
Amortization of Debt Issuance Costs     $ 300,000          
Interest Expense, Debt       $ 49,883   $ 56,875    
Amortization of Debt Issuance Costs and Discounts       $ 45,687   52,144    
Initial Horizon Credit Agreement [Member]                
Short-term Debt [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity   $ 10,000,000            
Proceeds from Lines of Credit   10,000,000            
Line of Credit Facility, Remaining Borrowing Capacity   5,000,000            
Interest and Debt Expense   $ 175,000            
End of term charge percentage   4.00%            
Debt Instrument, Fee Amount   $ 142,605            
Loan Processing Fee   100,000            
Debt Instrument, Unamortized Discount   782,116            
Debt Issuance Costs, Net   400,000            
Fair Value Adjustment of Warrants   507,116            
End of term fees   $ 275,000            
Initial Horizon Credit Agreement [Member] | Common Stock [Member]                
Short-term Debt [Line Items]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   190,114            
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 2.63            
Class of Warrant or Right, Outstanding   95,057            
Amendment to Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member]                
Short-term Debt [Line Items]                
Debt instrument related end term charges $ 200,000              
Debt instrument face amount $ 5,000,000              
Debt Instrument, Interest Rate Terms The obligations bore interest at a rate calculated based an amount by which the one-month LIBOR exceeds 2% plus 7.625%. In no event shall the interest rate be less than 9.625%. Payments pursuant to the Amendment were interest only for the first twelve (12) months after August 1, 2020, followed by a 21-month amortization period of principal and interest through the scheduled maturity date on April 1, 2023. In addition, the remaining $5 million in obligations was subject to an end of term fee equal, in the aggregate, to $275,000, which amount was payable upon the maturity of the obligations or upon the date of final payment or default, as applicable.              
Payment for Debt Extinguishment or Debt Prepayment Cost $ 5,000,000              
Debt Instrument, Fee Amount $ 275,000              
Debt Instrument, Restrictive Covenants In connection with the Amendment, Celsion agreed to a liquidity covenant which provides that, at all times, Celsion shall maintain unrestricted cash and/or cash equivalents on deposit in accounts over which the applicable Lenders maintain an account control agreement in an amount not less than $2.5 million. In addition, pursuant to the Amendment, Celsion agreed to provide evidence to Horizon on or before March 31, 2021, that it received aggregate cash proceeds of not less than $5 million from the sale of equity, debt, its New Jersey net operating losses, or a combination thereof, subsequent to the date of the Amendment. The Company met this requirement during the fourth quarter of 2020.              
Debt Instrument, Unamortized Discount $ 200,000             $ 109,706
Debt Issuance Costs, Net 5,000              
Warrants Not Settleable in Cash, Fair Value Disclosure $ 247,548              
Amendment to Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member] | Common Stock [Member]                
Short-term Debt [Line Items]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 247,525              
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 1.01              
Warrants cancelled 95,057              
Horizon Credit Agreement [Member]                
Short-term Debt [Line Items]                
Interest Expense, Debt           190,581    
Gain (Loss) on Contract Termination           $ 234,419    
Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member]                
Short-term Debt [Line Items]                
Debt instrument face amount $ 10,000,000