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Inventories (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Inventory [Line Items]      
Distributor channel inventories $ 1,445   $ 1,628
Losses incurred on valuation of inventory and write-off of obsolete inventory 119 $ 47  
Current:      
Raw materials 3,404   2,735
Finished goods 11,066   10,712
Inventoryincludingdistributorchannelinventories,net 14,470   13,447
Long-term:      
Raw materials 438   375
Finished Goods 1,583   1,643
Inventory, Noncurrent $ 2,021   $ 2,018