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STOCKHOLDERS’ EQUITY (Details Narrative) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
May 25, 2022
Apr. 06, 2022
Jan. 10, 2022
Mar. 31, 2021
Mar. 19, 2021
Jan. 22, 2021
Dec. 04, 2018
Jan. 31, 2021
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Mar. 03, 2022
Feb. 28, 2021
Feb. 28, 2020
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 31, 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.        
Stockholders equity note changes in capital structure description                       To continue listing on The NASDAQ Capital Market, which requires that the Company comply with the applicable listing requirements under NASDAQ Marketplace Rules, which requirements include, among others, a minimum bid price of at least $1.00 per share. On December 2, 2021, the Company received a letter from NASDAQ indicating that the closing bid price of the Company’s Common Stock fell below $1.00 per share for the previous 30 consecutive business days, and that the Company was therefore not in compliance with the minimum bid price requirement for continued inclusion on The NASDAQ Capital Market. The Company had 180 calendar days, until May 31, 2022, to regain compliance with this requirement, which occurs when the closing bid price of the Company’s Common Stock is at least $1.00 per share for a minimum of ten consecutive business days during the 180-day compliance period      
Reverse stock split common stock outstanding                     5,770,516        
Common stock, shares outstanding                 7,436,197   7,436,197 5,770,516      
Warrants issued                 4,059   4,059       213,333
Stock issued during period, value, new issues                     $ 6,722,654 $ 52,688,946      
Proceeds from issuance of common stock                     $ 6,722,667 $ 52,688,946      
Share price     $ 285                        
Preferred stock, shares issued                 0   0 0      
Preferred stock, stated value     $ 300           $ 0.01   $ 0.01 $ 0.01 $ 300    
OriginalIssueDiscountRate     500.00%                        
Proceeds from issuance of preferred stock     $ 14,250,000                        
Preferred stock, shares outstanding                 0   0 0      
Proceeds from issuance under placement                     $ 1,000,000        
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                        
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, shares outstanding                         50,000    
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                 336,075            
Proceeds from sale of stock                 $ 503,798            
Market Offering Agreement [Member] | Forecast [Member]                              
Accumulated Other Comprehensive Income (Loss) [Line Items]                              
Number of shares sold                   1,653,392          
Proceeds from sale of stock                   $ 2,465,656          
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                       500,000      
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       769,230                      
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   6,600,000        
Warrants issued                 2,500,000   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   400,000        
Warrants issued                 200,000   200,000     81,111  
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                     $ 16,644 $ 29,755      
Stock issued, shares                     1,664,349 2,975,503