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Composition of Certain Financial Statement Captions - Inventories, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventories, net [Abstract]    
Raw materials $ 885 $ 1,009
Work in process 1,021 816
Finished goods 1,819 2,473
Inventories, net $ 3,725 $ 4,298