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Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventory [Line Items]
Raw materials, current	$ 5,225us-gaap_InventoryRawMaterialsNetOfReserves	$ 4,246us-gaap_InventoryRawMaterialsNetOfReserves
Work in process	4,757us-gaap_InventoryWorkInProcessNetOfReserves	11,310us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods	3,751us-gaap_InventoryFinishedGoodsNetOfReserves	5,026us-gaap_InventoryFinishedGoodsNetOfReserves
Finished goods inventory held by others		627us-gaap_OtherInventoryMaterialsSuppliesAndMerchandiseUnderConsignment
Total inventory, current	13,733us-gaap_InventoryNet	21,209us-gaap_InventoryNet
Raw materials, long-term	0us-gaap_InventoryNoncurrent	5,482us-gaap_InventoryNoncurrent
Total inventory	$ 13,733amrn_TotalInventoryNet	$ 26,691amrn_TotalInventoryNet

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Total Inventory Net

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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Gross amount of inventory owned by the entity but in the hands of a customer, typically a reseller.

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