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Stockholders' Equity (Details Narrative) - USD ($)
 1 Months Ended 9 Months Ended 12 Months Ended
Oct. 28, 2019
Dec. 04, 2018
Aug. 31, 2018
Nov. 13, 2019
Oct. 27, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
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             $ 6,175,527 $ 1,236,584  
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       2,800,000   100,000
Proceeds from issuance of common stock             $ 5,500,000   $ 200,000
2018 Aspire Purchase Agreements [Member] | Subsequent Event [Member]                  
Stock issued during period, shares, new issues         515,598        
Proceeds from issuance of common stock         $ 800,000        
2019 Aspire Purchase Agreements [Member]                  
Stock issued during period, shares, new issues             100,000    
2019 Aspire Purchase Agreements [Member] | Subsequent Event [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.                
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             345,084    
Proceeds from issuance of common stock             $ 800,000    
Aggregate value available for issuance             $ 1,520,000    
Capital on Demand Agreement [Member] | Subsequent Event [Member]                  
Stock issued during period, shares, new issues       125,302          
Proceeds from issuance of common stock       $ 213,000