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Stockholders’ Equity (Details Narrative) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
May 25, 2022
Apr. 06, 2022
Jan. 10, 2022
Mar. 31, 2021
Mar. 19, 2021
Jan. 22, 2021
Dec. 04, 2018
Nov. 07, 2022
Jan. 31, 2021
Mar. 31, 2022
Sep. 30, 2022
Sep. 30, 2021
Mar. 03, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]                            
Shelf registration statement amount         $ 100,000,000                  
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 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                     7,098,741     5,770,516
Stock Issued During Period, Value, New Issues                     $ 6,275,346 $ 52,688,945    
Proceeds from issuance of common stock                     $ 6,275,346 $ 52,688,945    
Share price     $ 285                      
Preferred stock, shares issued                     0     0
Preferred stock, stated value     $ 300               $ 0.01   $ 300 $ 0.01
Proceeds from issuance of preferred stock     $ 14,250,000                      
Common stock, par value                     $ 0.01     $ 0.01
Proceeds from issuance under placement                     $ 1,000,000      
Preferred stock, shares outstanding                     0     0
Series A Convertible Redeemable Preferred Stock [Member]                            
Accumulated Other Comprehensive Income (Loss) [Line Items]                            
Share price     $ 300                      
Preferred stock, shares issued     50,000                      
Preferred stock, stated value     $ 0.01                      
Proceeds from issuance of preferred stock     $ 28,500,000                      
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]                            
Share price     $ 300                      
Preferred stock, shares issued     50,000                      
Preferred stock, stated value     $ 0.01                      
Preferred stock, conversion price     $ 15.00                      
Conversion of stock, shares issued     1,000,000                      
Preferred stock, voting rights     right to cast 3,000 votes per share of Series B Preferred Stock on the Reverse Stock Split.                      
Common stock, par value     $ 15.00                      
Preferred stock, shares outstanding                         50,000  
Series A & B Preferred Stock [Member]                            
Accumulated Other Comprehensive Income (Loss) [Line Items]                            
Proceeds from issuance under placement                   $ 1,110,000        
Interest expense on preferred stock                   4,551,567        
Shares issued, redemption value                   3,000,000        
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                          
Market Offering Agreement [Member] | Subsequent Event [Member]                            
Accumulated Other Comprehensive Income (Loss) [Line Items]                            
Number of shares sold               329,511            
Proceeds from sale of stock               $ 494,445            
Capital on DemandTM Sales Agreement [Member]                            
Accumulated Other Comprehensive Income (Loss) [Line Items]                            
Less than 12 months, unrealized gains, fair value             $ 16,000,000.0              
Capital on Demand Agreement [Member]                            
Accumulated Other Comprehensive Income (Loss) [Line Items]                            
Stock issued, shares                       477,877    
Proceeds from issuance of common stock                       $ 6,900,000    
Securities Purchase Agreement [Member] | January 2021 Registered Direct Offering [Member]                            
Accumulated Other Comprehensive Income (Loss) [Line Items]                            
Stock issued, shares           1,728,395                
Proceeds from issuance of common stock           $ 35,000,000                
Share price           $ 20.25                
Placement agent fee description                 In connection with the January 2021 Offering, the Company entered into a placement agent agreement with A.G.P./Alliance Global Partners (“AGP,” and together with Brookline Capital Markets, the “January 2021 Placement Agents”) pursuant to which the Company agreed to pay the January 2021 Placement Agents a cash fee equal to 7% of the aggregate gross proceeds raised from the sale of the securities sold in the January 2021 Offering and reimburse the January 2021 Placement Agents for certain of their expenses in an amount not to exceed $82,500.          
Securities Purchase Agreement [Member] | March 2021 Registered Direct Offering [Member]                            
Accumulated Other Comprehensive Income (Loss) [Line Items]                            
Stock issued, shares       769,231                    
Proceeds from issuance of common stock       $ 15,000,000                    
Share price       $ 19.50                    
Placement agent fee description       Placement Agent Agreement”) with AGP, as lead placement agent (together with JonesTrading Institutional Services LLC and Brookline Capital Markets, a division of Arcadia Securities, LLC, serving as co-placement agents, the “March 2021 Placement Agents”), pursuant to which the Company agreed to pay the March 2021 Placement Agents an aggregate cash fee equal to 7% of the aggregate gross proceeds raised from the sale of the securities sold in the offering and reimburse the Placement Agents for certain of their expenses in an amount not to exceed $82,500.                    
Securities Purchase Agreement [Member] | April 2022 Registered Direct Offering [Member]                            
Accumulated Other Comprehensive Income (Loss) [Line Items]                            
Stock issued, shares   1,328,274                        
Proceeds from issuance of common stock   $ 7,000,000.0                        
Share price   $ 5.27                        
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      
Warrants issued                     2,500,000      
Proceeds from issuance under placement                     $ 110,000      
Minimum [Member]                            
Accumulated Other Comprehensive Income (Loss) [Line Items]                            
Common stock, shares outstanding                     400,000      
Warrants issued                     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                     $ 13,283 $ 29,755    
Stock issued, shares                     1,328,274 2,975,503