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Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts Payable and Accrued Liabilities [Line Items]    
Payroll and payroll-related expenses $ 3,525us-gaap_EmployeeRelatedLiabilitiesCurrent $ 2,112us-gaap_EmployeeRelatedLiabilitiesCurrent
Research and development expenses 4,391amrn_ResearchAndDevelopmentAccruedExpenseCurrent [1]  
Sales and marketing accruals 1,509us-gaap_AccruedMarketingCostsCurrent 2,922us-gaap_AccruedMarketingCostsCurrent
Accrued revenue allowances 4,717amrn_AccruedLiabilitiesSalesAllowancesCurrent 1,216amrn_AccruedLiabilitiesSalesAllowancesCurrent
All other 2,126us-gaap_OtherLiabilitiesCurrent 3,344us-gaap_OtherLiabilitiesCurrent
Accrued expenses and other current liabilities $ 16,268amrn_AccruedExpensesAndOtherLiabilitiesCurrent $ 9,594amrn_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.