Commitments and Contingencies	9 Months Ended
Sep. 30, 2025
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	(5) Commitments and Contingencies The Company accrues a liability for legal contingencies when it believes that it is both probable that a liability has been incurred and that it can reasonably estimate the amount of the loss. The Company reviews these accruals and adjusts them to reflect ongoing negotiations, settlements, rulings, advice of legal counsel and other relevant information. To the extent new information is obtained and the Company's views on the probable outcomes of claims, suits, assessments, investigations or legal proceedings change, changes in the Company's accrued liabilities would be recorded in the period in which such determination is made. For the matters referenced below, the amount of liability is not probable nor can the amount be reasonably estimated; therefore, accruals have not been made. In addition, in accordance with the relevant authoritative guidance, for matters in which the likelihood of material loss is at least reasonably possible, the Company provides disclosure of the possible loss or range of loss. If a reasonable estimate cannot be made, however, the Company will provide disclosure to that effect. Litigation Updates The Company intends to vigorously enforce its intellectual property rights relating to VASCEPA, but cannot predict the outcome of such lawsuits or other proceedings described in the Company's Form 10-K. Except as described below, there have been no material updates to our litigation as reported in the Company’s Form 10-K. On November 30, 2020, the Company filed a patent infringement lawsuit against Hikma for making, selling, offering to sell, and importing generic icosapent ethyl capsules in and into the U.S. in a manner that the Company alleges induced the infringement of patents covering the use of VASCEPA to reduce specified CV risk. On January 4, 2022, the district court for the District of Delaware granted a motion to dismiss the Company's lawsuit for failure to state a claim. Thereafter, the Company appealed to the Court of Appeals for the Federal Circuit. On June 25, 2024, the Federal Circuit issued a decision reversing the district court, finding that the Company's allegations against Hikma plausibly state a claim alleging Hikma actively induced infringement of the asserted patents. Hikma filed a petition for rehearing en banc on August 22, 2024, which was denied on October 17, 2024. On February 14, 2025, Hikma filed a petition for a writ of certiorari with the Supreme Court of the U.S. seeking review of the Federal Circuit decision reversing the district court. The infringement case continues to proceed within the district court during the pendency of the petition. On March 31, 2023, the Company’s former chief executive officer, Karim Mikhail, filed a complaint against the Company and certain of its affiliates in the Superior Court of New Jersey, Law Division – Somerset County, captioned Mikhail v. Amarin Corporation, plc (Docket No. SOM-L-000366-23), concerning Mr. Mikhail’s alleged “constructive termination” from the Company. The complaint seeks unspecified damages arising from claims for breaches of his employment agreement, Executive Severance and Change of Control Plan, and the implied covenant of good faith and fair dealing. On April 3, 2023, the case moved to the U.S. District Court for the District of New Jersey (Civ. No. 3:23-cv-01856). On June 30, 2023, all defendants moved to dismiss this case without prejudice due to lack of jurisdiction. On March 4, 2024, the District Court granted the motion in part and denied the motion in part, permitting the parties to pursue limited discovery on the issue of personal jurisdiction. On March 20, 2025, the Company filed a new motion to dismiss for failure of plaintiff to state a claim. The Company believes it has valid defenses and will vigorously defend against the claims but cannot predict the outcome. The Company is unable to reasonably estimate the loss exposure, if any, associated with these claims. In addition to the above, in the ordinary course of business, the Company is from time to time involved in lawsuits, claims, investigations, proceedings, and threats of litigation relating to intellectual property, commercial arrangements and other matters. Milestone and Supply Purchase Obligations The Company currently has long-term supply agreements with multiple API suppliers and encapsulators. The Company is relying on these suppliers to meet current and potential future global demand for VASCEPA. Certain supply agreements require annual minimum volume commitments by the Company and certain volume shortfalls may require payments for such shortfalls. These agreements include requirements for the suppliers to meet certain product specifications and qualify their materials and facilities with applicable regulatory authorities, including the U.S. FDA. The Company has incurred certain costs associated with the qualification of product produced by these suppliers. The Company continues to negotiate with contract suppliers to align its supply arrangements with current and future global demand, which may result in additional costs to the Company. As of the date of filing of this Quarterly Report, the Company has a total of approximately $190.8 million in future contractual purchase obligations without consideration to ongoing discussions with other suppliers. Under the Laxdale agreement, upon receipt of a marketing approval in Europe for a further indication of VASCEPA (or further indication of any other product acquired from Laxdale in 2004), the Company must make an aggregate stock or cash payment (at the sole option of each such former shareholder) of £5.0 million (approximately $6.7 million as of September 30, 2025). The Company has no provision for any of these obligations since the amounts are either not paid or payable as of September 30, 2025.

Commitments and Contingencies

9 Months Ended

Sep. 30, 2025

Commitments and Contingencies Disclosure [Abstract]

(5) Commitments and Contingencies

The Company accrues a liability for legal contingencies when it believes that it is both probable that a liability has been incurred and that it can reasonably estimate the amount of the loss. The Company reviews these accruals and adjusts them to reflect ongoing negotiations, settlements, rulings, advice of legal counsel and other relevant information. To the extent new information is obtained and the Company's views on the probable outcomes of claims, suits, assessments, investigations or legal proceedings change, changes in the Company's accrued liabilities would be recorded in the period in which such determination is made. For the matters referenced below, the amount of liability is not probable nor can the amount be reasonably estimated; therefore, accruals have not been made. In addition, in accordance with the relevant authoritative guidance, for matters in which the likelihood of material loss is at least reasonably possible, the Company provides disclosure of the possible loss or range of loss. If a reasonable estimate cannot be made, however, the Company will provide disclosure to that effect.

Litigation Updates

The Company intends to vigorously enforce its intellectual property rights relating to VASCEPA, but cannot predict the outcome of such lawsuits or other proceedings described in the Company's Form 10-K. Except as described below, there have been no material updates to our litigation as reported in the Company’s Form 10-K.

On November 30, 2020, the Company filed a patent infringement lawsuit against Hikma for making, selling, offering to sell, and importing generic icosapent ethyl capsules in and into the U.S. in a manner that the Company alleges induced the infringement of patents covering the use of VASCEPA to reduce specified CV risk. On January 4, 2022, the district court for the District of Delaware granted a motion to dismiss the Company's lawsuit for failure to state a claim. Thereafter, the Company appealed to the Court of Appeals for the Federal Circuit. On June 25, 2024, the Federal Circuit issued a decision reversing the district court, finding that the Company's allegations against Hikma plausibly state a claim alleging Hikma actively induced infringement of the asserted patents. Hikma filed a petition for rehearing en banc on August 22, 2024, which was denied on October 17, 2024. On February 14, 2025, Hikma filed a petition for a writ of certiorari with the Supreme Court of the U.S. seeking review of the Federal Circuit decision reversing the district court. The infringement case continues to proceed within the district court during the pendency of the petition.

On March 31, 2023, the Company’s former chief executive officer, Karim Mikhail, filed a complaint against the Company and certain of its affiliates in the Superior Court of New Jersey, Law Division – Somerset County, captioned Mikhail v. Amarin Corporation, plc (Docket No. SOM-L-000366-23), concerning Mr. Mikhail’s alleged “constructive termination” from the Company. The complaint seeks unspecified damages arising from claims for breaches of his employment agreement, Executive Severance and Change of Control Plan, and the implied covenant of good faith and fair dealing. On April 3, 2023, the case moved to the U.S. District Court for

the District of New Jersey (Civ. No. 3:23-cv-01856). On June 30, 2023, all defendants moved to dismiss this case without prejudice due to lack of jurisdiction. On March 4, 2024, the District Court granted the motion in part and denied the motion in part, permitting the parties to pursue limited discovery on the issue of personal jurisdiction. On March 20, 2025, the Company filed a new motion to dismiss for failure of plaintiff to state a claim. The Company believes it has valid defenses and will vigorously defend against the claims but cannot predict the outcome. The Company is unable to reasonably estimate the loss exposure, if any, associated with these claims.

In addition to the above, in the ordinary course of business, the Company is from time to time involved in lawsuits, claims, investigations, proceedings, and threats of litigation relating to intellectual property, commercial arrangements and other matters.

Milestone and Supply Purchase Obligations

The Company currently has long-term supply agreements with multiple API suppliers and encapsulators. The Company is relying on these suppliers to meet current and potential future global demand for VASCEPA. Certain supply agreements require annual minimum volume commitments by the Company and certain volume shortfalls may require payments for such shortfalls.

These agreements include requirements for the suppliers to meet certain product specifications and qualify their materials and facilities with applicable regulatory authorities, including the U.S. FDA. The Company has incurred certain costs associated with the qualification of product produced by these suppliers.

The Company continues to negotiate with contract suppliers to align its supply arrangements with current and future global demand, which may result in additional costs to the Company. As of the date of filing of this Quarterly Report, the Company has a total of approximately $190.8 million in future contractual purchase obligations without consideration to ongoing discussions with other suppliers.

Under the Laxdale agreement, upon receipt of a marketing approval in Europe for a further indication of VASCEPA (or further indication of any other product acquired from Laxdale in 2004), the Company must make an aggregate stock or cash payment (at the sole option of each such former shareholder) of £5.0 million (approximately $6.7 million as of September 30, 2025).

The Company has no provision for any of these obligations since the amounts are either not paid or payable as of September 30, 2025.