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Revenue Recognition - Summary of Net Revenues Disaggregated by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 78,035	$ 56,888	$ 217,500	$ 169,059
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	29,660		81,702
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,200		19,725
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	38,714		112,333
All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,461		3,740
BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	51,026		140,012
BBU [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	20,508		55,794
BBU [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	7,013		16,615
BBU [Member] | Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	22,136		64,223
BBU [Member] | All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,369		3,380
VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	20,728		60,757
VI Chip [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,265		24,035
VI Chip [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,119		2,861
VI Chip [Member] | Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	11,252		33,544
VI Chip [Member] | All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	92		317
Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,281		16,731
Picor [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	887		1,873
Picor [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	68		249
Picor [Member] | Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 5,326		14,566
Picor [Member] | All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue			$ 43

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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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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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