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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (31,126)us-gaap_NetIncomeLoss $ (25,980)us-gaap_NetIncomeLoss
Adjustments to reconcile loss to net cash used in operating activities:    
Depreciation and amortization 42us-gaap_DepreciationAndAmortization 56us-gaap_DepreciationAndAmortization
Excess tax provision on stock-based awards 552us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities 1us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Amortization of debt discount and debt issuance costs 1,811us-gaap_AmortizationOfFinancingCostsAndDiscounts 1,173us-gaap_AmortizationOfFinancingCostsAndDiscounts
Amortization of intangible asset 161us-gaap_AmortizationOfIntangibleAssets 161us-gaap_AmortizationOfIntangibleAssets
Gain on changes in fair value of derivative liabilities (464)us-gaap_UnrealizedGainLossOnDerivatives (4,393)us-gaap_UnrealizedGainLossOnDerivatives
Deferred income taxes (95)us-gaap_DeferredIncomeTaxExpenseBenefit (24)us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in assets and liabilities:    
Restricted cash   400us-gaap_IncreaseDecreaseInRestrictedCash
Accounts receivable (703)us-gaap_IncreaseDecreaseInAccountsReceivable (380)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (2,450)us-gaap_IncreaseDecreaseInInventories 4,861us-gaap_IncreaseDecreaseInInventories
Prepaid and other current assets 340us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,380)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other non-current assets 129us-gaap_IncreaseDecreaseInOtherNoncurrentAssets 1,339us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Accrued interest payable (1,292)us-gaap_IncreaseDecreaseInInterestPayableNet (405)us-gaap_IncreaseDecreaseInInterestPayableNet
Deferred revenue 14,625us-gaap_IncreaseDecreaseInDeferredRevenue (1,703)us-gaap_IncreaseDecreaseInDeferredRevenue
Accounts payable and other current liabilities 2,549us-gaap_IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities (3,105)us-gaap_IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities
Other non-current liabilities 245us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities  
Net cash used in operating activities (12,643)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (27,494)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES:    
Net cash used in investing activities 0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of preferred stock, net of transaction costs 52,253us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock  
Proceeds from exercise of stock options, net of transaction costs 4us-gaap_ProceedsFromStockOptionsExercised 285us-gaap_ProceedsFromStockOptionsExercised
Proceeds from exercise of warrants, net of transaction costs 2,713us-gaap_ProceedsFromWarrantExercises  
Excess provision on stock-based awards (552)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities (1)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Acquisition of treasury stock (117)us-gaap_PaymentsForRepurchaseOfCommonStock  
Payments under capital leases (2)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (26)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Net cash provided by financing activities 54,299us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 258us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 41,656us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (27,236)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 119,539us-gaap_CashAndCashEquivalentsAtCarryingValue 191,514us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS, END OF PERIOD 161,195us-gaap_CashAndCashEquivalentsAtCarryingValue 164,278us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the year for:    
Interest 4,273us-gaap_InterestPaid 3,636us-gaap_InterestPaid
Income taxes 17us-gaap_IncomeTaxesPaid 33us-gaap_IncomeTaxesPaid
Non-cash transactions:    
Transfer of preferred stock purchase option derivative liability to equity 868amrn_DerivativeLiabilitiesTransferredToEquityClassifications  
Warrant    
Adjustments to reconcile loss to net cash used in operating activities:    
Stock-based compensation (9)us-gaap_ShareBasedCompensation
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember		 (72)us-gaap_ShareBasedCompensation
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
Options and Restricted Stock Units    
Adjustments to reconcile loss to net cash used in operating activities:    
Stock-based compensation $ 3,042us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= amrn_StockOptionsAndRestrictedStockUnitsMember		 $ 1,957us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= amrn_StockOptionsAndRestrictedStockUnitsMember