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Segment and Geographic Information - Revenue by Location and Product Type (Details) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenue | $ 115,072 | $ 104,858
Power discrete |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenue | 92,255 | 83,678
Power IC |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenue | 19,415 | 18,097
Packaging and testing services |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenue | 3,402 | 3,083
Hong Kong |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenue | 91,591 | 85,230
China |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenue | 20,397 | 17,120
South Korea |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenue | 169 | 287
United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenue | 1,973 | 1,378
Other countries |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenue | $ 942 | $ 843

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