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Revenue Recognition - Summary of Net Revenues Disaggregated by Category (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
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	67,777		191,071
Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,009		22,858
Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,207		3,379
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	24		138
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	18		54
BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	51,026		140,012
BBU [Member] | Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	44,269		123,147
BBU [Member] | Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,236		15,934
BBU [Member] | Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	513		885
BBU [Member] | Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	8		46
VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	20,728		60,757
VI Chip [Member] | Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	17,853		52,787
VI Chip [Member] | Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,254		5,673
VI Chip [Member] | Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,604		2,224
VI Chip [Member] | Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	8		46
VI Chip [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	9		27
Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,281		16,731
Picor [Member] | Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,655		15,137
Picor [Member] | Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	519		1,251
Picor [Member] | Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	90		270
Picor [Member] | Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	8		46
Picor [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 9		$ 27

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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
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-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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