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Revenue - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 65,725	$ 65,269
BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	46,625	40,637
VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	16,566	20,139
Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,534	4,493
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	54,714	56,760
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	39,948	35,474
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	12,803	17,306
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,963	3,980
Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	9,283	7,906
Stocking Distributors, Net of Sales Allowances [Member] | BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,117	4,963
Stocking Distributors, Net of Sales Allowances [Member] | VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,617	2,554
Stocking Distributors, Net of Sales Allowances [Member] | Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	549	389
Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,673	510
Non-recurring Engineering [Member] | BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	548	175
Non-recurring Engineering [Member] | VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,125	245
Non-recurring Engineering [Member] | Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	90
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	36	75
Royalties [Member] | BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	12	25
Royalties [Member] | VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	12	25
Royalties [Member] | Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	12	25
Other
Disaggregation of Revenue [Line Items]
Revenue	19	18
Other | BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Other | VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	9	9
Other | Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 10	$ 9

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+ References

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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