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Segment and Geographic Information - Revenue by Location and Product Type (Details) - USD ($) $ in Thousands	3 Months Ended
	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

X

- 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

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+ References

No definition available.

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