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Stockholders’ Equity (Details Narrative) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 19, 2023
May 25, 2022
Apr. 06, 2022
Jan. 10, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Mar. 03, 2022
Jan. 13, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Reverse stock split, description               On February 28, 2022, the Company effected a 15-for-1 reverse stock split of its common stock which was made effective for trading purposes as of the commencement of trading on March 1, 2022. As of that date, each of the 15 shares of issued and outstanding common stock and equivalents was consolidated into one share of common stock. All shares have been restated to reflect the effects of the 15-for-1 reverse stock split. In addition, at the market open on March 1, 2022, the Company’s common stock started trading under a new CUSIP number 15117N602, although the Company’s ticker symbol, CLSN, remained unchanged.        
Reverse stock split common stock outstanding               5,770,467        
Common stock, shares outstanding         9,251,981     9,251,981   7,436,197    
Stock issued during period, value, new issues         $ 198,562 $ 6,339,369   $ 2,672,924 $ 6,339,369      
Preferred stock, shares issued         0     0   0    
Preferred stock, stated value       $ 300 $ 0.01     $ 0.01   $ 0.01 $ 300  
Proceeds from issuance of preferred stock       $ 28,500,000                
Common stock, par value         $ 0.01     $ 0.01   $ 0.01    
Redemption term description               Each holder of the Preferred Stock had the right to cause the Company to redeem all or part of their shares of the Preferred Stock from the earlier of receipt of stockholder approval of the Reverse Stock Split or of 90 days following the original issue date until 120 days following the original issue date, the “Redemption Date,” in cash at a redemption price equal to 105% of the stated value plus an amount equal to accumulated but unpaid dividends, if any, on such shares (whether or not earned or declared, but excluding interest on such dividends) up to, but excluding, the Redemption Date.        
Placement agent fees               $ 1,000,000        
Preferred stock, shares outstanding         0     0   0    
Shares issued, redemption value                      
Legal fees $ 583,500                      
Proceeds from issuance of common stock               $ 2,672,926 6,339,369      
Series A Convertible Redeemable Preferred Stock [Member]                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Preferred stock, shares issued       50,000                
Preferred stock, stated value       $ 0.01                
Share price       $ 300                
OriginalIssueDiscountRate       5.00%                
Preferred stock, conversion price       $ 13.65                
Conversion of stock, shares issued       1,098,901                
Common stock, par value       $ 13.65                
Preferred stock, shares outstanding                     50,000  
Series B Convertible Redeemable Preferred Stock [Member]                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Preferred stock, shares issued       50,000                
Preferred stock, stated value       $ 0.01                
Share price       $ 285               $ 300
Proceeds from issuance of preferred stock       $ 14,250,000                
Preferred stock, conversion price                       $ 15.00
Conversion of stock, shares issued                       1,000,000
Common stock, par value       $ 15.00                
Preferred stock, shares outstanding                     50,000  
Series A & B Preferred [Member]                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Interest expense on preferred stock             $ 4,551,567          
Shares issued, redemption value             3,000,000          
Proceeds from issuance under placement             1,110,000          
Legal fees             $ 441,567          
Market Offering Agreement [Member]                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Stock issued during period, value, new issues   $ 7,500,000                    
Number of shares sold               1,815,584   336,075    
Proceeds from sale of stock               $ 2,672,924   $ 503,798    
Preferred Stock Purchase Agreement [Member] | Series B Convertible Redeemable Preferred Stock [Member]                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Preferred stock, voting rights       right to cast 3,000 votes per share of Series B Preferred Stock on the Reverse Stock Split.                
Securities Purchase Agreement [Member] | April 2022 Registered Direct Offering [Member]                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Share price     $ 5.27                  
Stock issued, shares     1,328,274                  
Proceeds from issuance of common stock     $ 7,000,000.0                  
Placement agent fee description     In connection with the April 2022 Offering, the Company entered into a placement agent agreement with A.G.P./Alliance Global Partners (the “April 2022 Placement Agent”) pursuant to which the Company agreed to pay the April 2022 Placement Agent a cash fee equal to 6.5% of the aggregate gross proceeds raised from the sale of the securities sold in the April 2022 Offering and reimburse the April 2022 Placement Agent for certain of their expenses in an amount not to exceed $50,000.                  
Maximum [Member]                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Common stock, shares outstanding         6,600,000     6,600,000        
Warrants issued         2,500,000     2,500,000        
Payments of stock issuance costs               $ 110,000        
Minimum [Member]                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Common stock, shares outstanding         400,000     400,000        
Warrants issued         200,000     200,000        
Common Stock [Member]                        
Accumulated Other Comprehensive Income (Loss) [Line Items]                        
Reverse stock split common stock outstanding               86,557,736        
Stock issued during period, value, new issues         $ 1,550 $ 13,283   $ 18,156 13,283      
Shares issued, redemption value                      
Stock issued, shares         154,976 1,328,274   1,815,584 1,328,274