XML 13 R1.htm IDEA: XBRL DOCUMENT v3.22.1
Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 30, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Current Fiscal Year End Date --12-31    
Entity File Number 001-15911    
Entity Registrant Name CELSION CORPORATION    
Entity Central Index Key 0000749647    
Entity Tax Identification Number 52-1256615    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 997 LENOX DRIVE    
Entity Address, Address Line Two SUITE 100    
Entity Address, City or Town LAWRENCEVILLE    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 08648    
City Area Code (609)    
Local Phone Number 896-9100    
Title of 12(b) Security Common Stock, Par Value $0.01 Per Share    
Trading Symbol CLSN    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 109.9
Entity Common Stock, Shares Outstanding   5,770,516  
Documents Incorporated by Reference NONE    
ICFR Auditor Attestation Flag false    
Auditor Name WithumSmith+Brown, PC    
Auditor Location Princeton, New Jersey    
Auditor Firm ID 100