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Restructuring - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Oct. 31, 2013	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Percentage of reduction in global work force	50.00%amrn_ReductionInGlobalWorkforcePercentage
Charges for severance and related benefits		$ 2.8us-gaap_SeveranceCosts1
Research and Development
Restructuring Cost and Reserve [Line Items]
Charges for severance and related benefits		0.2us-gaap_SeveranceCosts1 / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Charges for severance and related benefits		$ 2.6us-gaap_SeveranceCosts1 / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember

X

- Definition

Reduction In Global Workforce Percentage

+ References

No definition available.

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- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

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