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Revenue - Summary of Net Revenues Disaggregated by Geography (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
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	29,241	25,623
United States [Member] | BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	22,292	16,991
United States [Member] | VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,237	7,999
United States [Member] | Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	712	633
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,995	5,373
Europe [Member] | BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,009	4,725
Europe [Member] | VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	923	573
Europe [Member] | Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	63	75
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	28,011	33,356
Asia Pacific [Member] | BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	17,111	18,211
Asia Pacific [Member] | VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	9,158	11,387
Asia Pacific [Member] | Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,742	3,758
All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,478	917
All Other [Member] | BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,213	710
All Other [Member] | VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	248	180
All Other [Member] | Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 17	$ 27

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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://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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