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Stock-Based Compensation (Details Narrative) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 19, 2019 | Sep. 28, 2018 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 10, 2021 | Jun. 15, 2020 | May 14, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  |  |  | $ 1.97 | $ 3.07 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  | $ 2,400,000 |  | $ 2,400,000 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  | 1 year |  |  |  |
Equity Stock Awards [Member] | Granted Under 2018 Plan and 2007 Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  | 6,473,451 |  | 6,473,451 |  |  |  |
Inducement Awards [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  | 140,004 |  | 140,004 |  |  |  |
Stock Options and Restricted Stock Awards [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | $ 700,624 | $ 417,476 | $ 3,073,569 | $ 1,448,202 |  |  |
Stock Options and Restricted Stock Awards [Member] | Research and Development Expense [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | 241,288 | 164,035 | 1,123,376 | 542,157 |  |  |
Stock Options and Restricted Stock Awards [Member] | General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | $ 459,336 | $ 253,441 | $ 1,950,193 | $ 906,045 |  |  |
2018 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  | 2,700,000 |  | 2,700,000 |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  | 14,198,424 |  | 14,198,424 |  |  |  |
2018 Stock Incentive Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  |  | 7,700,000 | 2,500,000 | 1,200,000
2018 Stock Incentive Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  |  | 14,100,000 | 6,400,000 | 3,900,000
2007 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock options, strike price description |  |  |  |  | Options are generally granted with strike prices equal to the fair market value of a share of Celsion common stock on the date of grant. Incentive stock options may be granted to purchase shares of common stock at a price not less than 100% of the fair market value of the underlying shares on the date of grant, provided that the exercise price of any incentive stock option granted to an eligible employee owning more than 10% of the outstanding stock of Celsion must be at least 110% of such fair market value on the date of grant. Only officers and key employees may receive incentive stock options. |  |  |  |
Inducement Option Grants [Member] | Five New Employees [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 2.18 | $ 2.77 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |  |  |  |  |  |  |
Inducement Option Grants [Member] | Five New Employees [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares, Issued | 13,000 | 19,000 |  |  |  |  |  |  |
Inducement Option Grants [Member] | Five New Employees [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares, Issued | 140,004 | 164,004 |  |  |  |  |  |  |
2018 Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  | 7,724,973 |  | 7,724,973 |  |  |  |

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