Nature of Business and Basis of Presentation	12 Months Ended
Dec. 31, 2015
Nature of Business and Basis of Presentation	(1) Nature of Business and Basis of Presentation *Nature of Business* Amarin Corporation plc (“Amarin” or the “Company”) is a biopharmaceutical company with expertise in lipid science focused on the commercialization and development of therapeutics to improve cardiovascular health. The Company’s lead product, Vascepa^® (icosapent ethyl) capsules, is approved by the U.S. Food and Drug Administration, or FDA, for use as an adjunct to diet to reduce triglyceride levels in adult patients with severe (TG >500 mg/dL) hypertriglyceridemia. Vascepa is available in the United States by prescription only. In January 2013, the Company began selling and marketing Vascepa in the United States. In August 2015, in addition to marketing Vascepa for severe hypertriglyceridemia, the Company was given authority and commenced marketing Vascepa for mixed dyslipidemia, for use as an adjunct to diet and an add-on to statin therapy to reduce triglyceride levels in adult patients who despite statin therapy have high triglycerides (TG >500 mg/dL). The Company sells Vascepa principally to a limited number of major wholesalers, as well as selected regional wholesalers and specialty pharmacy providers, or collectively, its Distributors, that in turn resell Vascepa to retail pharmacies for subsequent resale to patients and healthcare providers. The Company markets Vascepa through its sales force of approximately 150 sales professionals, including sales representatives and their managers. In May 2014, Kowa Pharmaceuticals America, Inc. commenced co-promotion of Vascepa in accordance with a co-promotion agreement with the Company. Kowa Pharmaceuticals America, Inc. co-promotes Vascepa through its approximately 250 sales representatives who now devote a substantial portion of their time to promoting Vascepa in conjunction with the promotion of Kowa Pharmaceutical America, Inc.’s primary product, a branded statin for patients with high cholesterol. The Company operates in one business segment. The Company is also developing Vascepa for FDA approval of potential additional indications for use. In particular, the Company is conducting a cardiovascular outcomes study of Vascepa, titled REDUCE-IT (Reduction of Cardiovascular Events with EPA—Intervention Trial). The REDUCE-IT study is designed to evaluate the efficacy of Vascepa in reducing major cardiovascular events in a high-risk patient population on statin therapy. *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 of America (the “U.S.” or 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 (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities as of 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, 2015, 2014 and 2013 are not necessarily indicative of the results for any future period. Certain prior year balances have been reclassified to conform to current year presentation. 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, 2015, the Company had cash and cash equivalents of $107.0 million. The Company’s consolidated balance sheets also include derivative liabilities as well as long-term debt and exchangeable senior notes. The January 2012 exchangeable senior notes, or the 2012 Notes, may be redeemed on or after January 19, 2017. The May 2014 exchangeable senior notes, or the 2014 Notes and the November 2015 exchangeable senior notes, or the 2015 Notes, may be redeemed on or after January 19, 2019 at the option of the holders and is not puttable by the holders prior to this date except upon the occurrence of certain contingent events. The 2012 Notes are exchangeable under certain circumstances into cash, American Depository Shares, or ADSs, or a combination of cash and ADSs, at the Company’s election. The 2014 Notes and 2015 Notes are exchangeable under certain circumstances into ADSs. Accordingly, the long-term debt and exchangeable senior notes do not represent a short-term claim on the liquid assets of the Company. The Company believes its cash and cash equivalents will be sufficient to fund its projected operations for at least the next twelve months. Depending on the level of cash generated from operations, additional capital may be required to sustain operations.

(1) Nature of Business and Basis of Presentation

Nature of Business

Amarin Corporation plc (“Amarin” or the “Company”) is a biopharmaceutical company with expertise in lipid science focused on the commercialization and development of therapeutics to improve cardiovascular health.

The Company’s lead product, Vascepa^® (icosapent ethyl) capsules, is approved by the U.S. Food and Drug Administration, or FDA, for use as an adjunct to diet to reduce triglyceride levels in adult patients with severe (TG >500 mg/dL) hypertriglyceridemia. Vascepa is available in the United States by prescription only. In January 2013, the Company began selling and marketing Vascepa in the United States. In August 2015, in addition to marketing Vascepa for severe hypertriglyceridemia, the Company was given authority and commenced marketing Vascepa for mixed dyslipidemia, for use as an adjunct to diet and an add-on to statin therapy to reduce triglyceride levels in adult patients who despite statin therapy have high triglycerides (TG >500 mg/dL). The Company sells Vascepa principally to a limited number of major wholesalers, as well as selected regional wholesalers and specialty pharmacy providers, or collectively, its Distributors, that in turn resell Vascepa to retail pharmacies for subsequent resale to patients and healthcare providers. The Company markets Vascepa through its sales force of approximately 150 sales professionals, including sales representatives and their managers. In May 2014, Kowa Pharmaceuticals America, Inc. commenced co-promotion of Vascepa in accordance with a co-promotion agreement with the Company. Kowa Pharmaceuticals America, Inc. co-promotes Vascepa through its approximately 250 sales representatives who now devote a substantial portion of their time to promoting Vascepa in conjunction with the promotion of Kowa Pharmaceutical America, Inc.’s primary product, a branded statin for patients with high cholesterol. The Company operates in one business segment.

The Company is also developing Vascepa for FDA approval of potential additional indications for use. In particular, the Company is conducting a cardiovascular outcomes study of Vascepa, titled REDUCE-IT (Reduction of Cardiovascular Events with EPA—Intervention Trial). The REDUCE-IT study is designed to evaluate the efficacy of Vascepa in reducing major cardiovascular events in a high-risk patient population on statin therapy.

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 of America (the “U.S.” or 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 (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities as of 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, 2015, 2014 and 2013 are not necessarily indicative of the results for any future period. Certain prior year balances have been reclassified to conform to current year presentation.

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, 2015, the Company had cash and cash equivalents of $107.0 million. The Company’s consolidated balance sheets also include derivative liabilities as well as long-term debt and exchangeable senior notes. The January 2012 exchangeable senior notes, or the 2012 Notes, may be redeemed on or after January 19, 2017. The May 2014 exchangeable senior notes, or the 2014 Notes and the November 2015 exchangeable senior notes, or the 2015 Notes, may be redeemed on or after January 19, 2019 at the option of the holders and is not puttable by the holders prior to this date except upon the occurrence of certain contingent events. The 2012 Notes are exchangeable under certain circumstances into cash, American Depository Shares, or ADSs, or a combination of cash and ADSs, at the Company’s election. The 2014 Notes and 2015 Notes are exchangeable under certain circumstances into ADSs. Accordingly, the long-term debt and exchangeable senior notes do not represent a short-term claim on the liquid assets of the Company.

The Company believes its cash and cash equivalents will be sufficient to fund its projected operations for at least the next twelve months. Depending on the level of cash generated from operations, additional capital may be required to sustain operations.