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Financial Statement Details - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Finished goods $ 14,331 $ 19,277
Raw materials and components 6,072 11,865
Total inventory $ 20,403 $ 31,142