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BALANCE SHEET COMPONENTS - Property and Equipment, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Jun. 30, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment gross $ 10,614 $ 8,642
Less: Accumulated depreciation and amortization (3,821) (2,666)
Property and equipment, net 6,793 5,976
Testing equipment
   
Property, Plant and Equipment [Line Items]    
Property and equipment gross 3,642 3,309
Computer and other equipment
   
Property, Plant and Equipment [Line Items]    
Property and equipment gross 946 841
Tooling equipment
   
Property, Plant and Equipment [Line Items]    
Property and equipment gross 2,633 1,737
Furniture and fixtures
   
Property, Plant and Equipment [Line Items]    
Property and equipment gross 727 652
Leasehold improvements
   
Property, Plant and Equipment [Line Items]    
Property and equipment gross 2,421 1,858
Software
   
Property, Plant and Equipment [Line Items]    
Property and equipment gross $ 245 $ 245