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Stock-Based Compensation (Details Narrative) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 19, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jun. 15, 2020
Gross proceeds from issuance of common stock upon exercise of stock option				$ 371,895
Shares of common stock issued upon exercise of stock option
Non-Vested Stock-Based Compensation Arrangements [Member]
Inducement option grant, exercise price per share				$ 3.10	$ 1.88
Unrecognized compensation cost related to non-vested stock based compensation		$ 2,400,000		$ 2,400,000
Stock based compensation cost expected to be recognized, weighted average period				1 year 6 months
Equity Stock Awards [Member] | Granted Under 2018 Plan and 2007 Plan [Member]
Number of shares reserved for future issuance		4,594,022		4,594,022
Inducement Awards [Member]
Number of shares reserved for future issuance		140,004		140,004
Stock Options and Restricted Stock Awards [Member]
Compensation cost		$ 578,761	$ 622,696	$ 1,030,726	$ 1,313,842
Stock Options and Restricted Stock Awards [Member] | Research and Development Expense [Member]
Compensation cost		200,186	239,406	378,122	479,794
Stock Options and Restricted Stock Awards [Member] | General and Administrative Expense [Member]
Compensation cost		$ 378,575	$ 383,290	$ 652,604	$ 834,048
Common Stock [Member]
Shares of common stock issued upon exercise of stock option		140,864		140,864
2018 Stock Incentive Plan [Member]
Equity awards, number of stock authorized		2,700,000		2,700,000
Number of shares reserved for future issuance		6,510,174		6,510,174
2018 Stock Incentive Plan [Member] | Minimum [Member]
Number of equity awards available for future issuance		1,200,000		1,200,000			2,500,000
2018 Stock Incentive Plan [Member] | Maximum [Member]
Number of equity awards available for future issuance		3,900,000		3,900,000			6,400,000
2007 Stock Incentive Plan [Member]
Number of stock options granted, during period				688,531
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] | Two New Employees [Member] | Restricted Stock Awards [Member]
Number of shares issued	13,000
Inducement Option Grants [Member] | Two New Employees [Member] | Common Stock [Member]
Number of shares issued	140,004
Inducement Option Grants [Member] | Five New Employees [Member]
Inducement option grant, exercise price per share	$ 2.18
Option vested period	3 years
2018 Plan [Member]
Number of shares reserved for future issuance		1,916,152		1,916,152
2018 Plan [Member] | Common Stock [Member]
Gross proceeds from issuance of common stock upon exercise of stock option				$ 371,895
Shares of common stock issued upon exercise of stock option				140,864
2019 Bonus Program [Member] | Common Stock [Member]
Number of shares issued		429,855		429,855
Annual bonus awards, percentage				50.00%

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