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BALANCE SHEET COMPONENTS - Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Jun. 30, 2016
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross $ 33,711 $ 28,397
Less: Accumulated depreciation and amortization (20,366) (15,444)
Property and Equipment, Net 13,345 12,953
Testing equipment    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross 7,579 6,051
Computer and other equipment    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross 5,399 4,857
Tooling equipment    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross 7,442 5,801
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross 1,525 1,325
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross 6,079 5,136
Software    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross 5,687 2,488
Software in development    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross $ 0 $ 2,739