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Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Accounts Payable and Accrued Liabilities [Line Items] |  |  |
Payroll and payroll-related expenses | $ 3,525 us-gaap_EmployeeRelatedLiabilitiesCurrent |  | $ 2,112 us-gaap_EmployeeRelatedLiabilitiesCurrent
Research and development expenses | 4,391 amrn_ResearchAndDevelopmentAccruedExpenseCurrent | [1] |
Sales and marketing accruals | 1,509 us-gaap_AccruedMarketingCostsCurrent |  | 2,922 us-gaap_AccruedMarketingCostsCurrent
Accrued revenue allowances | 4,717 amrn_AccruedLiabilitiesSalesAllowancesCurrent |  | 1,216 amrn_AccruedLiabilitiesSalesAllowancesCurrent
All other | 2,126 us-gaap_OtherLiabilitiesCurrent |  | 3,344 us-gaap_OtherLiabilitiesCurrent
Accrued expenses and other current liabilities | $ 16,268 amrn_AccruedExpensesAndOtherLiabilitiesCurrent |  | $ 9,594 amrn_AccruedExpensesAndOtherLiabilitiesCurrent
[1] | Research and development accruals are based on the timing of clinical trial activities and related progress payments. As of December 31, 2013, the Company was in a prepaid position related to such expenses.

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for the marketing, trade and selling of the entity's goods and services. Marketing costs would include expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services; costs of public relations and corporate promotions; and obligations incurred and payable for sales discounts, rebates, price protection programs, etc. offered to customers and under government programs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References No definition available. + Details
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