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Nature of Business and Basis of Presentation | 12 Months Ended
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Dec. 31, 2012
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 public limited company with its primary stock market listing in the United States on the NASDAQ Global Market. Amarin was originally incorporated in England as a private limited company on March 1, 1989 under the Companies Act 1985, and re-registered in England as a public limited company on March 19, 1993. Amarin is a biopharmaceutical company with expertise in lipid science focused on the commercialization and development of therapeutics to improve cardiovascular health. On July 26, 2012, the Company received FDA approval to market and sell its lead product Vascepa® (icosapent ethyl) capsules (formerly known as AMR 101) as an adjunct to diet to reduce triglyceride levels in adult patients with severe (TG >500mg/dL) hypertriglyceridemia. Triglycerides are fats in the blood. Amarin is also developing Vascepa for the treatment of patients with high triglyceride levels who are also on statin therapy for elevated LDL-C levels, or what the Company refers to as mixed dyslipidemia. The Company has evaluated subsequent events from December 31, 2012 through the date of the issuance of these consolidated financial statements and has determined that no material subsequent events have occurred that would affect the information presented in these consolidated financial statements or to require additional disclosure not already reflected herein. Basis of 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. Prior to 2004, the Company was in the business of selling a previous biopharmaceutical compound, which has since been discontinued. The Company’s current focus is on the commercialization and development of Vascepa, which received approval from the FDA on July 26, 2012. The Company is not considered a development stage business, as the release and sale of the previous product represented the exit of the Company from the development stage. At December 31, 2012, the Company had cash and cash equivalents of $260.2 million. The Company’s consolidated balance sheet also includes a derivative liability (see footnote 7—Warrants and Derivative Liability) as well as Long term debt and Exchangeable Senior Notes (see footnote 8—Debt). The derivative liability reflects the fair value of outstanding warrants to purchase shares of the Company’s common stock. This liability can only be settled in shares of the Company’s stock and, as such, would only result in cash inflows upon the exercise of the warrants—not a cash out flow. The long term debt is not callable except upon a change in control. The Exchangeable Senior Notes may be redeemed on or after January 19, 2017 at the option of the holders. The Notes are exchangeable under certain circumstances into cash, ADSs, or a combination of cash and ADSs, at the Company’s election. Accordingly, the warrant derivative liability, long term debt and Exchangeable Senior Notes do not present 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 operations for at least the next twelve months, including the commercial launch of Vascepa, continued advancement of the REDUCE-IT cardiovascular outcomes study, working capital and other general corporate activities.

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