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BALANCE SHEET COMPONENTS - Property and Equipment, Net (Details) (USD $)
 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment gross $ 12,369,000 $ 8,642,000
Less: Accumulated depreciation and amortization (5,109,000) (2,666,000)
Property and equipment, net 7,260,000 5,976,000
Depreciation expense 2,600,000 1,800,000
Testing equipment
    
Property, Plant and Equipment [Line Items]    
Property and equipment gross 3,785,000 3,309,000
Computer and other equipment
    
Property, Plant and Equipment [Line Items]    
Property and equipment gross 1,019,000 841,000
Tooling equipment
    
Property, Plant and Equipment [Line Items]    
Property and equipment gross 2,898,000 1,737,000
Furniture and fixtures
    
Property, Plant and Equipment [Line Items]    
Property and equipment gross 973,000 652,000
Leasehold improvements
    
Property, Plant and Equipment [Line Items]    
Property and equipment gross 3,173,000 1,858,000
Software
    
Property, Plant and Equipment [Line Items]    
Property and equipment gross $ 521,000 $ 245,000