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Inventories (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Inventory [Line Items]          
Distributor channel inventories $ 1,629   $ 1,629   $ 1,698
Losses incurred on valuation of inventory and write-off of obsolete inventory 83 $ 9 130 $ 424  
Current:          
Raw materials 3,237   3,237   3,056
Finished goods 12,732   12,732   11,408
Inventoryincludingdistributorchannelinventories,net 15,969   15,969   14,464
Long-term:          
Raw materials 59   59   59
Finished Goods 621   621   817
Inventory, Noncurrent $ 680   $ 680   $ 876