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BALANCE SHEET COMPONENTS - Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Jun. 30, 2020
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 129,563 $ 120,769
Less: Accumulated depreciation (49,674) (42,247)
Property and equipment, net 79,889 78,522
Testing equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 14,985 12,476
Tooling equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 15,387 13,601
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 14,781 12,944
Computer and other equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 8,401 7,676
Software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 7,818 7,266
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 2,384 2,147
Corporate aircraft    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 65,807 $ 64,659