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Consolidated Statements Of Stockholders' Deficit (USD $) In Thousands, except Share data | Total | July Two Thousand And Thirteen | Common Shares | Common Shares July Two Thousand And Thirteen | Additional Paid-in Capital | Additional Paid-in Capital July Two Thousand And Thirteen | Treasury Shares | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2011 | $ (5,962)us-gaap_StockholdersEquity |  | $ 113,321 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | $ 449,393 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | $ (217)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (568,459)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Beginning Balance (in shares) at Dec. 31, 2011 |  |  | 135,832,542 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Exercise of warrants (in shares) |  |  | 11,047,579 amrn_StockIssuedDuringPeriodSharesStockWarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Exercise of warrants | 16,720 amrn_StockIssuedDuringPeriodValueStockWarrantsExercised |  | 8,540 amrn_StockIssuedDuringPeriodValueStockWarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 8,180 amrn_StockIssuedDuringPeriodValueStockWarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Exercise of stock options (in shares) |  |  | 3,380,413 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Exercise of stock options | 8,205 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  | 2,659 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 5,546 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Vesting of restricted stock units (in shares) |  |  | 97,398 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Vesting of restricted stock units |  |  | 76 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (76)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Conversion option contained in exchangeable notes | 22,898 amrn_AdjustmentsToAdditionalPaidInCapitalResultingFromConversionOfConvertibleDebtIntoEquity |  |  |  | 22,898 amrn_AdjustmentsToAdditionalPaidInCapitalResultingFromConversionOfConvertibleDebtIntoEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Tax benefits realized from stock-based compensation | 11,334 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |  |  | 11,334 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Reacquisition of conversion option in convertible notes | 103,885 us-gaap_AdjustmentsToAdditionalPaidInCapitalOther |  |  |  | 103,885 us-gaap_AdjustmentsToAdditionalPaidInCapitalOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Share issuances for services (in shares) |  |  | 3,001 us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Share issuances for services | 32 us-gaap_StockIssuedDuringPeriodValueIssuedForServices |  | 1 us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 31 us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock-based compensation | 18,075 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  | 18,075 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Net loss | (179,184)us-gaap_NetIncomeLoss |  |  |  |  |  |  | (179,184)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance at Dec. 31, 2012 | (3,997)us-gaap_StockholdersEquity |  | 124,597 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 619,266 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (217)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (747,643)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance (in shares) at Dec. 31, 2012 |  |  | 150,360,933 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Exercise of warrants (in shares) | 147,050 amrn_StockIssuedDuringPeriodSharesStockWarrantsExercised |  | 147,050 amrn_StockIssuedDuringPeriodSharesStockWarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Exercise of warrants | 160 amrn_StockIssuedDuringPeriodValueStockWarrantsExercised |  | 113 amrn_StockIssuedDuringPeriodValueStockWarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 47 amrn_StockIssuedDuringPeriodValueStockWarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Exercise of stock options (in shares) | 386,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  | 386,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Exercise of stock options | 627 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  | 292 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 335 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock issued in financing (in shares) |  |  |  | 21,700,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / amrn_PeriodAxis = amrn_JulyTwoThousandAndThirteenMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock issued in financing |  | 121,206 us-gaap_StockIssuedDuringPeriodValueNewIssues / amrn_PeriodAxis = amrn_JulyTwoThousandAndThirteenMember |  | 16,401 us-gaap_StockIssuedDuringPeriodValueNewIssues / amrn_PeriodAxis = amrn_JulyTwoThousandAndThirteenMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 104,805 us-gaap_StockIssuedDuringPeriodValueNewIssues / amrn_PeriodAxis = amrn_JulyTwoThousandAndThirteenMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Vesting of restricted stock units (in shares) |  |  | 93,048 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Vesting of restricted stock units |  |  | 71 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (71)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Tax benefits realized from stock-based compensation | (361)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |  |  | (361)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Reacquisition of conversion option in convertible notes | 24 us-gaap_AdjustmentsToAdditionalPaidInCapitalOther |  |  |  | 24 us-gaap_AdjustmentsToAdditionalPaidInCapitalOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Share issuances for services (in shares) |  |  | 4,032 us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Share issuances for services | 27 us-gaap_StockIssuedDuringPeriodValueIssuedForServices |  | 3 us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 24 us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock-based compensation | 14,685 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  | 14,685 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Net loss | (166,227)us-gaap_NetIncomeLoss |  |  |  |  |  |  | (166,227)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance at Dec. 31, 2013 | (33,856)us-gaap_StockholdersEquity |  | 141,477 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 738,754 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (217)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (913,870)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance (in shares) at Dec. 31, 2013 |  |  | 172,691,063 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Exercise of warrants (in shares) | 1,684,888 amrn_StockIssuedDuringPeriodSharesStockWarrantsExercised |  | 1,684,888 amrn_StockIssuedDuringPeriodSharesStockWarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Exercise of warrants | 1,651 amrn_StockIssuedDuringPeriodValueStockWarrantsExercised |  | 1,443 amrn_StockIssuedDuringPeriodValueStockWarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 208 amrn_StockIssuedDuringPeriodValueStockWarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Exercise of stock options (in shares) | 234,500 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  | 234,500 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Exercise of stock options | 307 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  | 193 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 114 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Tax benefits realized from stock-based compensation | (2,299)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |  |  | (2,299)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Reacquisition of conversion option in convertible notes | (10,100)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther |  |  |  | (10,100)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock-based compensation | 9,022 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  | 9,022 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Refund of equity issuance costs | 3,191 amrn_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCostsRefund |  |  |  | 3,191 amrn_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCostsRefund / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Net loss | (56,364)us-gaap_NetIncomeLoss |  |  |  |  |  |  | (56,364)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance at Dec. 31, 2014 | $ (88,448)us-gaap_StockholdersEquity |  | $ 143,113 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | $ 738,890 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | $ (217)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (970,234)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance (in shares) at Dec. 31, 2014 |  |  | 174,610,451 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |

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