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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 115,072 | $ 104,858
Power discrete |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 92,255 | 83,678
Power IC |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 19,415 | 18,097
Packaging and testing services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 3,402 | 3,083
Hong Kong |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 91,591 | 85,230
China |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 20,397 | 17,120
South Korea |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 169 | 287
United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,973 | 1,378
Other Countries |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 942 | $ 843

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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