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Inventories (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Inventory [Line Items]          
Distributor channel inventories $ 1,663   $ 1,663   $ 1,698
Losses incurred on valuation of inventory and write-off of obsolete inventory 266 $ 113 396 $ 537  
Current:          
Raw materials 3,003   3,003   3,056
Finished goods 12,822   12,822   11,408
Inventoryincludingdistributorchannelinventories,net 15,825   15,825   14,464
Long-term:          
Raw materials 67   67   59
Finished Goods 530   530   817
Inventory, Noncurrent $ 597   $ 597   $ 876