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Balance Sheet Details - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Finished goods $ 10,888 $ 19,277
Raw materials and components 10,076 11,865
Total inventories $ 20,964 $ 31,142