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Financial Statement Details - Summary of Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Finished goods $ 9,244 $ 14,331
Raw materials and components 3,693 6,072
Total inventories, net $ 12,937 $ 20,403