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Inventories - Summary of Inventories (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Inventories |  |
Finished goods | $ 11,728 us-gaap_InventoryFinishedGoods | $ 10,310 us-gaap_InventoryFinishedGoods
Work-in-process | 7,297 us-gaap_InventoryWorkInProcess | 7,492 us-gaap_InventoryWorkInProcess
Raw materials | 15,562 us-gaap_InventoryRawMaterials | 19,021 us-gaap_InventoryRawMaterials
Less: Inventory reserves | (6,700)us-gaap_InventoryValuationReserves | (4,597)us-gaap_InventoryValuationReserves
Inventories, net | $ 27,887 us-gaap_InventoryNet | $ 32,226 us-gaap_InventoryNet

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