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Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventory [Line Items]
Raw materials	$ 8,600	$ 5,225
Work in process	4,934	4,757
Finished goods	2,649	3,751
Total inventory	$ 16,183amrn_TotalInventoryNet	$ 13,733amrn_TotalInventoryNet

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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