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Stockholders' Equity (Details Narrative) - USD ($)
 1 Months Ended 2 Months Ended 12 Months Ended 68 Months Ended
Feb. 27, 2020
Oct. 28, 2019
Dec. 04, 2018
Aug. 31, 2018
Feb. 01, 2013
Sep. 30, 2018
Mar. 05, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Mar. 12, 2020
Shelf registration statement amount           $ 75,000,000          
Fair value of common stock issued as equity issuance costs and charged against paid in capital               $ 450,000    
Proceeds from issuance of common stock               $ 7,844,852 $ 858,515    
Warrants exercise price               $ 0.01      
2018 Aspire Purchase Agreements [Member]                      
Fair value of common stock issued as equity issuance costs and charged against paid in capital           $ 450,000          
2018 Aspire Purchase Agreements [Member]                      
Aggregate offering price, additions       $ 15,000,000              
Aggregate offering price, term       24 months              
Maximum number of shares purchased per business day       100,000              
Aggregate offering price       $ 15,000,000              
Aggregate offering price, description       The lowest sale price of the Company's common stock on the purchase date; or the arithmetic average of the three (3) lowest closing sale prices for the Company's common stock during the ten (10) consecutive trading days ending on the trading day immediately preceding the purchase date.              
Aspire purchase agreement, terms       In addition, on any date on which the Company submits a Purchase Notice to Aspire Capital in an amount equal to at least 100,000 shares, the Company also has the right, in its sole discretion, to present Aspire Capital with a volume-weighted average price purchase notice (each, a "VWAP Purchase Notice") directing Aspire Capital to purchase an amount of stock equal to up to 30% of the aggregate shares of the Company's common stock traded on its principal market on the next trading day (the "VWAP Purchase Date"), subject to a maximum number of shares the Company may determine. The purchase price per share pursuant to such VWAP Purchase Notice is generally 97% of the volume-weighted average price for the Company's common stock traded on its principal market on the VWAP Purchase Date.              
Maximum number of shares purchased per business day, additional       2,000,000              
Stock issued during period, shares, new issues       164,835       3,300,000 100,000    
Proceeds from issuance of common stock               $ 6,300,000 $ 200,000    
2019 Aspire Purchase Agreements [Member]                      
Aggregate offering price, additions   $ 10,000,000                  
Aggregate offering price, term   24 months                  
Maximum number of shares purchased per business day   100,000                  
Aggregate offering price   $ 10,000,000                  
Aggregate offering price, description   The lowest sale price of the Company's common stock on the purchase date; or the arithmetic average of the three (3) lowest closing sale prices for the Company's common stock during the ten (10) consecutive trading days ending on the trading day immediately preceding the purchase date.                  
Aspire purchase agreement, terms   In addition, on any date on which the Company submits a Purchase Notice to Aspire Capital in an amount of 100,000 shares, the Company also has the right, in its sole discretion, to present Aspire Capital with a VWAP Purchase Notice directing Aspire Capital to purchase an amount of stock equal to up to 30% of the aggregate shares of the Company's common stock traded on the VWAP Purchase Date, subject to a maximum number of shares the Company may determine. The purchase price per share pursuant to such VWAP Purchase Notice is generally 97% of the volume-weighted average price for the Company's common stock traded on its principal market on the VWAP Purchase Date.                  
Stock issued during period, shares, new issues   100,000           500,000      
Proceeds from issuance of common stock               $ 700,000      
2019 Aspire Purchase Agreements [Member] | Subsequent Event [Member]                      
Stock issued during period, shares, new issues             1,000,000        
Proceeds from issuance of common stock             $ 1,600,000        
Capital on DemandTM Sales Agreement [Member]                      
Aggregate offering price     $ 16,000,000                
Aggregate offering price, description     (i) the sale of all shares of our common stock subject to the Sales Agreement, and (ii) the termination of the Capital on Demand Agreement by JonesTrading or Celsion. The Capital on Demand Agreement may be terminated by JonesTrading or the Company at any time upon 10 days' notice to the other party, or by JonesTrading at any time in certain circumstances, including the occurrence of a material adverse change in the Company.                
Commission percentage for gross proceeds from common stock     3.00%                
Capital on Demand Agreement [Member]                      
Stock issued during period, shares, new issues               500,000      
Proceeds from issuance of common stock               $ 1,000,000      
Aggregate value available for issuance               $ 15,000,000      
Controlled Equity Offering SM Sales Agreement [Member]                      
Aggregate offering price         $ 25,000,000            
Stock issued during period, shares, new issues                   1,784,396  
Proceeds from issuance of common stock                   $ 12,800,000  
Proceeds from sale equity                 $ 1,200,000    
Sale of common stock, shares                 500,000    
Securities Purchase Agreement [Member] | Subsequent Event [Member]                      
Stock issued during period, shares, new issues 4,571,428                    
Proceeds from issuance of common stock $ 4,800,000                    
Shares issued, price per share $ 1.05                    
Securities Purchase Agreement [Member] | Subsequent Event [Member] | Original Warrants [Member]                      
Number of warrants to purchase common stock 2,971,428                    
Warrants term 5 years                    
Warrants exercise price $ 1.15                    
Private Exchange Agreements [Member] | Subsequent Event [Member] | Warrant [Member]                      
Number of warrants to purchase common stock                     3,200,000
Warrants term                     5 years
Warrants exercise price                     $ 1.24