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Summarizes Activity of the Net Product Revenue Allowance and Reserve Categories (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | $ 2,469 us-gaap_ValuationAllowancesAndReservesBalance |
Provision related to current period and deferred sales | 32,460 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense | 11,646 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Provision related to prior period sales | (128)amrn_ProvisionRelatedToPriorPeriodSales |
Credits/payments made for current period and deferred sales | (25,431)us-gaap_ValuationAllowancesAndReservesDeductions | (9,177)us-gaap_ValuationAllowancesAndReservesDeductions
Credits/payments made for prior period sales | (2,280)amrn_CreditsPaymentsMadeForPriorPeriodSales |
Ending balance | 7,090 us-gaap_ValuationAllowancesAndReservesBalance | 2,469 us-gaap_ValuationAllowancesAndReservesBalance
Allowance for Trade Receivables |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 1,071 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember |
Provision related to current period and deferred sales | 8,157 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | 4,178 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember
Provision related to prior period sales | (29)amrn_ProvisionRelatedToPriorPeriodSales / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember |
Credits/payments made for current period and deferred sales | (5,950)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | (3,107)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember
Credits/payments made for prior period sales | (1,042)amrn_CreditsPaymentsMadeForPriorPeriodSales / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember |
Ending balance | 2,207 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | 1,071 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember
Rebates Chargebacks And Discounts |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 1,137 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember |
Provision related to current period and deferred sales | 12,753 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember | 4,282 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember
Provision related to prior period sales | (80)amrn_ProvisionRelatedToPriorPeriodSales / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember |
Credits/payments made for current period and deferred sales | (9,143)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember | (3,145)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember
Credits/payments made for prior period sales | (1,057)amrn_CreditsPaymentsMadeForPriorPeriodSales / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember |
Ending balance | 3,610 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember | 1,137 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_RebatesChargebacksAndDiscountsMember
Allowance for Sales Returns |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 72 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember |
Provision related to current period and deferred sales | 397 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | 72 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 | 481 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | 72 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember
Other Incentive Programs |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 189 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember |
Provision related to current period and deferred sales | 11,153 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember | 3,114 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember
Provision related to prior period sales | (31)amrn_ProvisionRelatedToPriorPeriodSales / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember |
Credits/payments made for current period and deferred sales | (10,338)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember | (2,925)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember
Credits/payments made for prior period sales | (181)amrn_CreditsPaymentsMadeForPriorPeriodSales / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember |
Ending balance | $ 792 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember | $ 189 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = amrn_OtherIncentiveProgramsMember

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