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Revenue Recognition - Summary of Net Revenues Disaggregated by Category (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Revenue	$ 65,269
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	56,760
Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	7,906
Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	510
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	75
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	18
BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	40,637
BBU [Member] | Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	35,474
BBU [Member] | Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,963
BBU [Member] | Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	175
BBU [Member] | Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	25
VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	20,139
VI Chip [Member] | Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	17,306
VI Chip [Member] | Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,554
VI Chip [Member] | Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	245
VI Chip [Member] | Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	25
VI Chip [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	9
Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,493
Picor [Member] | Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,980
Picor [Member] | Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	389
Picor [Member] | Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	90
Picor [Member] | Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	25
Picor [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 9

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- 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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