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NOTES PAYABLE (Details Narrative) - USD ($)
 12 Months Ended
Jun. 18, 2021
Aug. 28, 2020
Jun. 27, 2018
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Feb. 28, 2020
Short-term Debt [Line Items]              
Financing fee           $ 145,539  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       7,273     213,333
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 48.30      
Horizon Credit Agreement Amendment [Member]              
Short-term Debt [Line Items]              
Amortization of Debt Issuance Costs       $ 139,428 $ 483,439    
Interest expense       $ 225,920 $ 808,899    
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 on April 1, 2023.      
Financing fees and expenses $ 243,370            
End of term charge percentage 3.00%            
Amortization of Debt Issuance Costs $ 300,000            
Interest expense       $ 106,709      
Amortization of Debt Issuance Costs and Discounts       97,831      
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 10,000,000        
Line of Credit Facility, Remaining Borrowing Capacity   5,000,000          
Financing fees and expenses     $ 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        
Financing fee     400,000        
Fair Value Adjustment of Warrants     $ 507,116        
End term fees       275,000      
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     12,674        
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 39.45        
Class of Warrant or Right, Outstanding     6,337        
Amendment to Horizon Credit Agreement [Member] | Horizon Technology Finance Corporation [Member]              
Short-term Debt [Line Items]              
Payment of debt end term charges   200,000          
Debt instrument face amount   $ 5,000,000   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 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.          
Payments of debt extinguishment costs   $ 5,000,000   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 provided that, at all times, Celsion maintain unrestricted cash and/or cash equivalents on deposit in accounts over which the applicable lenders maintained 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 NOLs, 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       109,706      
Financing fee       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   16,501          
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 15.15          
Warrants cancelled   6,337          
Horizon Credit Agreement [Member]              
Short-term Debt [Line Items]              
Interest expense       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