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Balance Sheet Components - Property, plant, and equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment excluding equipment and construction In progress, gross $ 399,740 $ 357,988
Land use rights 8,750 9,089
Less: accumulated depreciation (229,627) (225,184)
Property, plant and equipment excluding equipment and construction in progress, net 170,113 132,804
Equipment and construction in progress 198,436 198,852
Property, plant and equipment, net 368,549 331,656
Land    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment excluding equipment and construction In progress, gross 4,877 4,877
Building    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment excluding equipment and construction In progress, gross 33,836 4,325
Manufacturing machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment excluding equipment and construction In progress, gross 274,818 265,192
Equipment and tooling    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment excluding equipment and construction In progress, gross 17,891 16,605
Computer equipment and software    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment excluding equipment and construction In progress, gross 26,751 25,686
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment excluding equipment and construction In progress, gross 2,318 2,314
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment excluding equipment and construction In progress, gross $ 30,499 $ 29,900