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Note Payable (Details Narrative) - USD ($)
 3 Months Ended
Aug. 28, 2020
Jun. 27, 2018
Mar. 31, 2021
Mar. 31, 2020
Financing fees and expenses     $ 157,614 $ 339,365
Debt financing fees     $ 88,461  
Warrants exercise per share     $ 0.01  
Initial Horizon Credit Agreement Amendment [Member]        
Interest expense, debt, total     $ 120,313 243,299
Amortization of debt issuance costs     37,301 $ 96,066
Initial Horizon Credit Agreement [Member]        
Line of credit facility, maximum borrowing capacity   $ 10,000,000    
Proceeds from lines of credit, total   10,000,000    
Debt instrument, end term fee   142,605    
Financing fees and expenses   175,000    
Loan origination fees   100,000    
Debt instrument, unamortized discount   $ 782,116    
End of term charge percentage   4.00%    
Debt financing fees   $ 400,000    
Fair value of warrants   507,116    
End of term fees   $ 275,000    
Initial Horizon Credit Agreement [Member] | Common Stock Outstanding [Member]        
Warrants exercise per share   $ 2.63    
Warrants exercisable   190,114    
Warrants outstanding   95,057    
Amendment to Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member]        
Repayment of loans $ 5,000,000      
Debt instrument related end term charges 200,000      
Debt instrument face amount $ 5,000,000      
Debt instrument, interest rate terms The obligations bear 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 are 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 maturity date on April 1, 2023.      
Debt instrument, end term fee $ 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.      
Debt instrument, unamortized discount $ 200,000   $ 109,706  
Debt financing fees 5,000      
Payment of debt extinguishment 5,000,000      
New warrants fair value $ 247,548      
Amendment to Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member] | Common Stock Outstanding [Member]        
Warrants exercise per share $ 1.01      
Warrants exercisable 247,525      
Warrants cancelled 95,057      
Amendment to Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member] | One-Month LIBOR Exceeds 2% Plus [Member]        
Debt instrument interest rate 9.625%