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Stockholders' Equity (Details Narrative) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 69 Months Ended
Dec. 04, 2018
Aug. 31, 2018
Feb. 01, 2013
Aug. 13, 2019
Sep. 30, 2018
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Oct. 31, 2018
Shelf registration statement amount         $ 75,000,000          
Proceeds from issuance of common stock             $ 4,464,060 $ 1,236,584    
Aspire Purchase Agreement [Member]                    
Fair value of common stock issued as equity issuance costs and charged against paid in capital         $ 450,000          
Aspire Purchase Agreement [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         1,900,000   100,000  
Proceeds from issuance of common stock             $ 3,900,000   $ 200,000  
Aggregate value available for issuance             $ 10,500,000      
Aspire Purchase Agreement [Member] | Subsequent Event [Member]                    
Stock issued during period, shares, new issues       300,000            
Proceeds from issuance of common stock       $ 500,000            
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             259,961      
Proceeds from issuance of common stock             $ 600,000      
Aggregate value available for issuance             $ 15,400,000      
Capital on Demand Agreement [Member] | Subsequent Event [Member]                    
Stock issued during period, shares, new issues       85,000            
Proceeds from issuance of common stock       $ 154,000            
ATM Agreement [Member]                    
Stock issued during period, shares, new issues           457,070       1,784,396
Proceeds from issuance of common stock           $ 1,200,000       $ 12,800,000
ATM Agreement [Member] | Maximum [Member]                    
Aggregate offering price     $ 25,000,000