Commitments and Contingencies	9 Months Ended
Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 17. Commitments and Contingencies On October 29, 2020, a putative securities class action was filed against the Company and certain of its officers and directors (the “Spar Individual Defendants”) in the U.S. District Court for the District of New Jersey, captioned Spar v. Celsion Corporation, et al., Case No. 1:20-cv-15228 (“the Spar Action”). The plaintiff alleged that the Company and Individual Defendants made false and misleading statements regarding one of the Company’s drug candidates, ThermoDox®, and brings claims for damages under Section 10(b) of the Exchange Act and Rule 10b-5 promulgated thereunder against all Defendants, and under Section 20(a) of the Exchange Act of 1934 against the Individual Defendants. At this stage of the case neither the likelihood that a loss, if any, will be realized, nor an estimate of possible loss or range of loss, if any, can be determined. On February 6, 2023, the U.S. District Court granted a Motion to Dismiss filed by the Company and Spar Individual Defendants and granted Plaintiff leave to file an amended complaint within 30 days. Plaintiff did not file an amended complaint within the 30-day deadline. In September 2023, the U.S. District Court Issued an Order for Dismissal without prejudice. In February 2021, a derivative shareholder lawsuit was filed against the Company, as the nominal defendant, and certain of its directors and officers as defendants in the U.S. District Court for the District of New Jersey, captioned Fidler v. Michael H. Tardugno, et al., Case No. 3:21-cv-02662. The plaintiff alleges breach of fiduciary duty and other claims arising out of alleged statements made by certain of the Company’s directors and/or officers regarding ThermoDox®. The Company believes it has meritorious defenses to these claims and intends to vigorously contest this suit. At this stage of the case neither the likelihood that a loss, if any, will be realized, nor an estimate of possible loss or range of loss, if any, can be determined. The U.S. District Court has stayed the action pending an appeal in the Spar Action or until the time to appear has run in the Spar Action without any decision being made.

Commitments and Contingencies

9 Months Ended

Sep. 30, 2023

Commitments and Contingencies Disclosure [Abstract]

Note 17. Commitments and Contingencies

On October 29, 2020, a putative securities class action was filed against the Company and certain of its officers and directors (the “Spar Individual Defendants”) in the U.S. District Court for the District of New Jersey, captioned Spar v. Celsion Corporation, et al., Case No. 1:20-cv-15228 (“the Spar Action”). The plaintiff alleged that the Company and Individual Defendants made false and misleading statements regarding one of the Company’s drug candidates, ThermoDox®, and brings claims for damages under Section 10(b) of the Exchange Act and Rule 10b-5 promulgated thereunder against all Defendants, and under Section 20(a) of the Exchange Act of 1934 against the Individual Defendants. At this stage of the case neither the likelihood that a loss, if any, will be realized, nor an estimate of possible loss or range of loss, if any, can be determined. On February 6, 2023, the U.S. District Court granted a Motion to Dismiss filed by the Company and Spar Individual Defendants and granted Plaintiff leave to file an amended complaint within 30 days. Plaintiff did not file an amended complaint within the 30-day deadline. In September 2023, the U.S. District Court Issued an Order for Dismissal without prejudice.

In February 2021, a derivative shareholder lawsuit was filed against the Company, as the nominal defendant, and certain of its directors and officers as defendants in the U.S. District Court for the District of New Jersey, captioned Fidler v. Michael H. Tardugno, et al., Case No. 3:21-cv-02662. The plaintiff alleges breach of fiduciary duty and other claims arising out of alleged statements made by certain of the Company’s directors and/or officers regarding ThermoDox®. The Company believes it has meritorious defenses to these claims and intends to vigorously contest this suit. At this stage of the case neither the likelihood that a loss, if any, will be realized, nor an estimate of possible loss or range of loss, if any, can be determined. The U.S. District Court has stayed the action pending an appeal in the Spar Action or until the time to appear has run in the Spar Action without any decision being made.