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Inventories, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Summary of Inventory    
Raw materials $ 2,231 $ 2,378
Work in process 46 5
Finished goods 251 188
Inventories, gross 2,528 2,571
Less: inventory reserves (707) (709)
Inventories, net $ 1,821 $ 1,862