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Inventories (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Inventories |  |
Raw materials | $ 7,145 us-gaap_InventoryRawMaterials | $ 6,627 us-gaap_InventoryRawMaterials
Work in process | 1,142 us-gaap_InventoryWorkInProcess | 1,056 us-gaap_InventoryWorkInProcess
Finished goods | 4,606 us-gaap_InventoryFinishedGoods | 3,365 us-gaap_InventoryFinishedGoods
Total inventory | $ 12,893 us-gaap_InventoryNet | $ 11,048 us-gaap_InventoryNet

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