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Other Current Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items] |  |  |
Research and development credits receivable |  | $ 351 | [1]
Prepaid expenses and other | 1,837 | 712 |
Other current assets | $ 1,837 | $ 1,063 |
[1] | Represents refunds receivable in the U.K. for research and development expenditures incurred in 2009 at Amarin Neuroscience Ltd (ANL).

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- Definition The total of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer, and the aggregate carrying amount of current assets, as of the balance sheet date, not separately presented elsewhere in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 4 -Chapter 3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Section 45 -SubTopic 10 -Topic 210 -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 -Publisher FASB -Name Accounting Standards Codification -Paragraph 1 + Details
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