| Cover | Sep. 19, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 19, 2022 |
| 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 | 08648-2311 |
| City Area Code | (609) |
| Local Phone Number | 896-9100 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.01 per share |
| Trading Symbol | CLSN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
