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Stockholders’ Equity (Details Narrative) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 19, 2021
Jan. 22, 2021
Sep. 08, 2020
Jun. 22, 2020
Feb. 27, 2020
Dec. 04, 2018
Mar. 31, 2021
Sep. 30, 2018
Mar. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Mar. 12, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]                          
clsn_ShelfRegistrationStatementAmount $ 100,000,000             $ 75,000,000          
Proceeds from Issuance of Common Stock                   $ 52,697,265 $ 18,182,599    
Class of Warrant or Right, Exercise Price of Warrants or Rights                   $ 0.01      
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 During Period, Shares, New Issues                 7,200,000   1,200,000    
Proceeds from Issuance of Common Stock                 $ 6,900,000   $ 3,500,000    
Securities Purchase Agreement [Member]                          
Accumulated Other Comprehensive Income (Loss) [Line Items]                          
Stock Issued During Period, Shares, New Issues         4,571,428                
Proceeds from Issuance of Common Stock         $ 4,800,000                
Shares Issued, Price Per Share         $ 1.05                
Securities Purchase Agreement [Member] | Original Warrants [Member]                          
Accumulated Other Comprehensive Income (Loss) [Line Items]                          
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right         2,971,428                
Warrants and Rights Outstanding, Term         5 years                
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 1.15                
Exchange Agreements [Member]                          
Accumulated Other Comprehensive Income (Loss) [Line Items]                          
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right                   1,200,000      
Proceeds from Issuance of Warrants                   $ 1,500,000      
Exchange Agreements [Member] | Warrant [Member]                          
Accumulated Other Comprehensive Income (Loss) [Line Items]                          
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right                         3,200,000
Warrants and Rights Outstanding, Term                         5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights                         $ 1.24
Underwriting Agreement [Member] | Underwritten Offering [Member]                          
Accumulated Other Comprehensive Income (Loss) [Line Items]                          
Stock Issued During Period, Shares, New Issues       2,666,667                  
Proceeds from Issuance of Common Stock       $ 9,100,000                  
Shares Issued, Price Per Share       $ 3.75                  
Share Price       3.4875                  
[custom:UnderwritingDiscountPricePerShare]       $ 0.2625                  
Payments from sale of nols       7.00%                  
Underwriting Agreement [Member] | January 2021 Registered Direct Offering [Member]                          
Accumulated Other Comprehensive Income (Loss) [Line Items]                          
Stock Issued During Period, Shares, New Issues   25,925,925                      
Proceeds from Issuance of Common Stock   $ 35,000,000                      
Share Price   $ 1.35                      
Placement agent fee description.   In connection with the January 2021 Offering, the Company entered into a placement agent agreement (the “January 2021 Placement Agent Agreement”) with A.G.P./Alliance Global Partners (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.                      
Underwriting Agreement [Member] | March 2021 Registered Direct Offering [Member]                          
Accumulated Other Comprehensive Income (Loss) [Line Items]                          
Stock Issued During Period, Shares, New Issues             11,538,462            
Proceeds from Issuance of Common Stock             $ 15,000,000            
Share Price             $ 1.30   $ 1.30        
Placement agent fee description.             In connection with the March 2021 Offering, the Company entered into a placement agent agreement (the “March 2021 Placement Agent Agreement”) with A.G.P./Alliance Global Partners, as lead placement agent (“AGP,” and 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.            
LPC Purchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member]                          
Accumulated Other Comprehensive Income (Loss) [Line Items]                          
Stock Issued During Period, Shares, New Issues     26,000,000.0                 3,300,000  
Proceeds from Issuance of Common Stock                       $ 2,200,000  
LPC Purchase Agreement [Member] | LPC Commitment Shares [Member] | Lincoln Park Capital Fund, LLC [Member]                          
Accumulated Other Comprehensive Income (Loss) [Line Items]                          
Stock Issued During Period, Shares, New Issues     437,828