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Property Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Leasehold improvements	$ 107us-gaap_LeaseholdImprovementsGross	$ 107us-gaap_LeaseholdImprovementsGross
Computer equipment	63amrn_ComputerEquipmentGross	63amrn_ComputerEquipmentGross
Furniture and fixtures	240us-gaap_FurnitureAndFixturesGross	240us-gaap_FurnitureAndFixturesGross
Software	559us-gaap_CapitalizedComputerSoftwareGross	559us-gaap_CapitalizedComputerSoftwareGross
Property, plant and equipment, gross, total	969us-gaap_PropertyPlantAndEquipmentGross	969us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization	(588)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	(390)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Construction in progress	0us-gaap_ConstructionInProgressGross	0us-gaap_ConstructionInProgressGross
Property, plant and equipment, net	$ 381us-gaap_PropertyPlantAndEquipmentNet	$ 579us-gaap_PropertyPlantAndEquipmentNet

X

- Definition

Computer equipment, Gross

+ References

No definition available.

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-Publisher SEC

-Name Regulation S-X (SX)

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-Section 02

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-Article 5

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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-Publisher FASB

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-Paragraph 1

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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