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Summarizes Activity of the Net Product Revenue Allowance and Reserve Categories (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | $ 7,090 us-gaap_ValuationAllowancesAndReservesBalance | $ 2,469 us-gaap_ValuationAllowancesAndReservesBalance
Provision related to current period and deferred sales | 9,745 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense | 4,299 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Provision related to prior period sales | 74 amrn_ProvisionRelatedToPriorPeriodSales | 12 amrn_ProvisionRelatedToPriorPeriodSales
Credits/payments made for current period and deferred sales | (2,835)us-gaap_ValuationAllowancesAndReservesDeductions | (2,148)us-gaap_ValuationAllowancesAndReservesDeductions
Credits/payments made for prior period sales | (5,529)amrn_CreditsPaymentsMadeForPriorPeriodSales | (1,837)amrn_CreditsPaymentsMadeForPriorPeriodSales
Ending balance | 8,545 us-gaap_ValuationAllowancesAndReservesBalance | 2,795 us-gaap_ValuationAllowancesAndReservesBalance
Allowance for Trade Receivables |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 2,207 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | 1,071 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember
Provision related to current period and deferred sales | 2,756 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | 1,400 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember
Credits/payments made for current period and deferred sales | (462)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | (411)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember
Credits/payments made for prior period sales | (1,555)amrn_CreditsPaymentsMadeForPriorPeriodSales / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | (926)amrn_CreditsPaymentsMadeForPriorPeriodSales / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember
Ending balance | 2,946 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | 1,134 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember
Rebates Chargebacks And Discounts |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 3,610 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember | 1,137 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember
Provision related to current period and deferred sales | 5,145 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember | 1,930 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember
Provision related to prior period sales | 74 amrn_ProvisionRelatedToPriorPeriodSales / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember |
Credits/payments made for current period and deferred sales | (1,288)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember | (765)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember
Credits/payments made for prior period sales | (3,367)amrn_CreditsPaymentsMadeForPriorPeriodSales / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember | (911)amrn_CreditsPaymentsMadeForPriorPeriodSales / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember
Ending balance | 4,174 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember | 1,391 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember
Allowance for Sales Returns |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 481 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | 72 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember
Provision related to current period and deferred sales | 127 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | 68 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember
Provision related to prior period sales |  | 12 amrn_ProvisionRelatedToPriorPeriodSales / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember
Ending balance | 608 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | 152 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember
Other Incentive Programs |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 792 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember | 189 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember
Provision related to current period and deferred sales | 1,717 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember | 901 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember
Credits/payments made for current period and deferred sales | (1,085)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember | (972)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember
Credits/payments made for prior period sales | (607)amrn_CreditsPaymentsMadeForPriorPeriodSales / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember |
Ending balance | $ 817 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember | $ 118 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember

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