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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventory [Line Items]    
Raw materials $ 4,001 $ 4,820
Work in process 1,860 1,732
Finished goods 4,143 4,913
Inventory, gross 10,004 11,465
Less current inventory (5,064) (5,595)
Inventory Value Before Reserves 4,940 5,870
Less reserve for slow moving and excess inventory (3,949) (4,426)
Inventories, net non-current $ 991 $ 1,444