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Nature of Business and Basis of Presentation | 12 Months Ended
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Dec. 31, 2011
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 clinical-stage biopharmaceutical company focused on developing improved treatments for cardiovascular disease by capitalizing on its expertise in the field of lipid science and the known therapeutic benefits of essential fatty acids in cardiovascular disease. The Company is currently focusing its efforts on AMR101 (icosapent ethyl), a prescription-only omega-3 fatty acid, comprising not less than 96% ultra pure icosapent ethyl (ethyl-EPA). The Company has evaluated subsequent events from December 31, 2011 through the date of the issuance of these consolidated financial statements and has determined that no material subsequent events have occurred, except as disclosed below (see footnote 16—Subsequent Event) that would affect the information presented in these consolidated financial statements or to require additional disclosure. 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 development and commercialization of AMR101, which is still under development and not available for sale. However, 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, 2011, the Company had cash and cash equivalents of $116.6 million. The Company’s consolidated balance sheet also includes a significant derivative liability (see footnote 7—Warrants and Derivative Liability) reflecting 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 outflow. Accordingly, this warrant derivative liability presents neither a short nor long-term claim on the liquid assets of the Company. On January 9, 2012, Amarin, through its wholly-owned subsidiary Corsicanto Limited, a private limited company incorporated under the laws of Ireland, completed a private placement of $150.0 million in aggregate principal amount of its 3.50% exchangeable senior notes due 2032 resulting in net proceeds to the Company of $144.3 million. The notes are the senior unsecured obligations of Corsicanto and are guaranteed by Amarin. The Company believes its cash, including the net proceeds from the January 2012 financing, will be sufficient to fund its projected operations for at least the next twelve months which contemplates commercial preparation of AMR101, working capital and other general corporate activities. This is based on management’s current operational plans and activities at normal levels and does not assume any cash inflows from partnerships, warrant exercises or other dilutive or non-dilutive financings in the long-term.

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