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Revenue Recognition - Summary of Net Revenues Disaggregated by Geography (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Revenue	$ 65,269
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	25,623
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,373
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	33,356
All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	917
BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	40,637
BBU [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	16,991
BBU [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,725
BBU [Member] | Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	18,211
BBU [Member] | All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	710
VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	20,139
VI Chip [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	7,999
VI Chip [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	573
VI Chip [Member] | Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	11,387
VI Chip [Member] | All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	180
Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,493
Picor [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	633
Picor [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	75
Picor [Member] | Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,758
Picor [Member] | All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 27

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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