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SUBSEQUENT EVENTS (Details Narrative) - USD ($)
 12 Months Ended
Feb. 28, 2022
Jan. 10, 2022
Dec. 31, 2021
Mar. 03, 2022
Jan. 31, 2022
Dec. 31, 2020
Subsequent Event [Line Items]            
Preferred Stock, Shares Issued     0     0
Preferred Stock, Par or Stated Value Per Share     $ 0.01     $ 0.01
Preferred Stock Value        
Preferred Stock Shares Outstanding     0     0
Reverse Stock Split     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.      
Common stock, shares issued     5,770,538     2,713,424
Common Stock Shares Outstanding     5,770,516     2,713,402
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Investment         $ 250,000  
Preferred Stock, Par or Stated Value Per Share   $ 300        
Share Price   $ 285        
Proceeds from Issuance of Preferred Stock and Preference Stock   $ 14,250,000        
Preferred Stock Value       $ 300    
Reverse Stock Split 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.          
Common stock, shares issued 15          
Common Stock Shares Outstanding 15          
Subsequent Event [Member] | Series A Convertible Redeemable Preferred Stock [Member]            
Subsequent Event [Line Items]            
Preferred Stock, Shares Issued   50,000        
Preferred Stock, Par or Stated Value Per Share   $ 0.01        
Share Price   300        
Preferred Stock, Convertible, Conversion Price   $ 13.65        
Convertible Preferred Stock, Shares Issued upon Conversion   1,098,901        
Preferred Stock Shares Outstanding       50,000    
Subsequent Event [Member] | Series B Convertible Redeemable Preferred Stock [Member]            
Subsequent Event [Line Items]            
Preferred Stock, Shares Issued   50,000        
Preferred Stock, Par or Stated Value Per Share   $ 0.01        
Share Price   300        
Preferred Stock, Convertible, Conversion Price   $ 15.00        
Convertible Preferred Stock, Shares Issued upon Conversion   1,000,000        
Preferred Stock Shares Outstanding       50,000