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Nature of Business and Basis of Presentation | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Nature of Business and Basis of Presentation | (1) Nature of Business and Basis of Presentation Nature of Business Amarin Corporation plc, or Amarin, or the Company, is a pharmaceutical company focused on the commercialization and development of therapeutics to improve cardiovascular, or CV, health and reduce CV risk. The Company is commercialized in the United States, or the U.S, under the brand name VASCEPA® (icosapent ethyl). The Company has launched commercial operations in certain European countries, such as the United Kingdom, or the UK, and Spain and continues pre-launch commercial activities throughout the rest of Europe. The Company’s operations outside of the U.S. and Europe are in varying stages of development and commercialization with reliance on third-party commercial partners in select geographies, including China and Canada. The Company’s lead product, VASCEPA, was first approved by the U.S. Food and Drug Administration, or U.S. FDA, in July 2012 for use as an adjunct to diet to reduce triglyceride, or TG, levels in adult patients with severe (>500 mg/dL) hypertriglyceridemia, or the MARINE indication. In January 2013, the Company launched 1-gram size VASCEPA in the U.S. and in October 2016, introduced a 0.5-gram capsule size. On December 13, 2019, the U.S. FDA approved another indication and label expansion for VASCEPA based on the results of the Company’s long-term cardiovascular outcomes trial, REDUCE-IT®, or Reduction of Cardiovascular Events with EPA – Intervention Trial. VASCEPA is approved by the U.S. FDA as an adjunct to maximally tolerated statin therapy for reducing persistent cardiovascular risk in select high risk patients, or the REDUCE-IT indication. On March 30, 2020, following conclusion of a trial in late January 2020, the U.S. District Court for the District of Nevada, or the Nevada Court, issued a ruling in favor of two generic drug companies, Dr. Reddy’s Laboratories, Inc., or Dr. Reddy’s, and Hikma Pharmaceuticals USA Inc., or Hikma, and certain of their affiliates, or, collectively, the Defendants, that declared as invalid several of the Company's patents covering the MARINE indication. The Company sought appeals of the Nevada Court judgment up to the United States Supreme Court, but the Company was unsuccessful. As a result, the following generic versions of VASCEPA have obtained U.S. FDA approval with labeling consistent with the MARINE indication of VASCEPA and have entered the U.S. market:
Company |  | FDA MARINE Indication Approval |  | 1-gram Launch Date |  | 0.5-gram Launch Date
Hikma Pharmaceuticals USA Inc. |  | May 2020 |  | November 2020 |  | March 2023
Dr. Reddy’s Laboratories, Inc. |  | August 2020 |  | June 2021 |  | June 2023
Teva Pharmaceuticals USA, Inc. |  | September 2020 |  | January 2023 |  | September 2022
Apotex, Inc. |  | June 2021 |  | January 2022 |  | N/A
Zydus Lifesciences |  | April 2023 |  | N/A |  | N/A
Strides Pharma |  | September 2023 |  | N/A |  | N/A
Epic Pharma |  | December 2023 |  | N/A |  | N/A
On March 26, 2021, the European Commission, or EC, approved the marketing authorization application for VAZKEPA, hereinafter along with the U.S. brand name VASCEPA, collectively referred to as VASCEPA, in the European Union, or EU, to reduce the risk of cardiovascular events in high risk, statin-treated adult patients who have elevated triglycerides (>150 mg/dL) and either established cardiovascular disease or diabetes and at least one additional cardiovascular risk event. On April 22, 2021, the Company announced that the Medicines and Healthcare Products Regulatory Agency, or MHRA, approved VAZKEPA in England, Scotland and Wales to reduce cardiovascular risk. Collectively CHMP, EMA, EC and MHRA are referred to herein as the European Regulatory Authorities. In November 2020, the Company announced topline results from the Phase 3 clinical trial of VASCEPA conducted by the Company’s partner in China. On June 1, 2023, the Company announced the National Medical Products Administration, or NMPA, granted approval for VASCEPA under the MARINE indication and launched commercially in October 2023. On February 23, 2022, the Hong Kong Department of Health concluded their evaluation and approved the use of VASCEPA under the REDUCE-IT indication. The Company currently has strategic collaborations to develop and commercialize VASCEPA in select territories outside the United States and Europe. Amarin is responsible for supplying VASCEPA to all markets in which the product is sold, including the United States, and Europe, as well as in countries where the drug is promoted and sold via collaboration with third-party companies that compensate Amarin for such supply. Amarin is not responsible for providing any generic company with drug product. The Company operates in one business segment. Basis of Presentation The consolidated financial statements included herein have been prepared by the Company in accordance with accounting principles generally accepted in the United States and pursuant to the rules and regulations of the Securities and Exchange Commission, or the SEC. The consolidated financial statements reflect all adjustments of a normal and recurring nature that, in the opinion of management, are necessary to present fairly the Company’s financial position, results of operations and cash flows for the periods indicated. The preparation of the Company’s consolidated financial statements in conformity with U.S. Generally Accepted Accounting Principles, or GAAP, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. The results of operations for the years ended December 31, 2023, 2022 and 2021 are not necessarily indicative of the results for any future period. Certain numbers presented throughout this document may not add precisely to the totals provided due to rounding. Absolute and percentage changes are calculated using the underlying amounts in thousands. The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The accompanying consolidated financial statements of the Company and subsidiaries have been prepared on a basis which assumes that the Company will continue as a going concern, which contemplates the realization of assets and the satisfaction of liabilities and commitments in the normal course of business. At December 31, 2023, the Company had total assets of $831.7 million, of which $320.7 million consisted of cash and liquid short-term investments. More specifically, the Company had current assets of $725.0 million, including cash and cash equivalents of $199.3 million, short-term investments of $121.4 million, accounts receivable, net, of $133.6 million and current inventory of $258.6 million. In addition, at December 31, 2023, the Company had long-term inventory of $77.6 million. At December 31, 2023, the Company had no debt outstanding.

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