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Composition of Certain Financial Statement Captions - Inventories, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventories, net [Abstract]    
Raw materials $ 681 $ 885
Work in process 722 1,021
Finished goods 1,780 1,819
Inventories, net $ 3,183 $ 3,725