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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory [Line Items]    
Raw materials $ 2,957us-gaap_InventoryRawMaterialsNetOfReserves $ 2,299us-gaap_InventoryRawMaterialsNetOfReserves
Work in progress 53us-gaap_InventoryWorkInProcessNetOfReserves 140us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 712us-gaap_InventoryFinishedGoodsNetOfReserves 345us-gaap_InventoryFinishedGoodsNetOfReserves
Total $ 3,722us-gaap_InventoryNet $ 2,784us-gaap_InventoryNet [1]
[1] *Derived from the audited December 31, 2014 financial statements