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Significant Accounting Policies -Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue	$ 73,720	$ 78,035	$ 74,196	$ 65,269	$ 58,771	$ 56,888	$ 57,709	$ 54,462	$ 291,220	$ 227,830	$ 200,280
BBU [Member]
Revenue									186,704
Vi Chip [Member]
Revenue									81,674
Picor [Member]
Revenue									22,842
Direct Customers Contract Manufacturers And Non stocking Distributors [Member]
Revenue									254,785
Direct Customers Contract Manufacturers And Non stocking Distributors [Member] | BBU [Member]
Revenue									163,206
Direct Customers Contract Manufacturers And Non stocking Distributors [Member] | Vi Chip [Member]
Revenue									70,919
Direct Customers Contract Manufacturers And Non stocking Distributors [Member] | Picor [Member]
Revenue									20,660
Stocking Distributors Net Of Sales Allowances [Member]
Revenue									31,732
Stocking Distributors Net Of Sales Allowances [Member] | BBU [Member]
Revenue									22,362
Stocking Distributors Net Of Sales Allowances [Member] | Vi Chip [Member]
Revenue									7,653
Stocking Distributors Net Of Sales Allowances [Member] | Picor [Member]
Revenue									1,717
Non recurring Engineering [Member]
Revenue									4,422
Non recurring Engineering [Member] | BBU [Member]
Revenue									1,066
Non recurring Engineering [Member] | Vi Chip [Member]
Revenue									2,996
Non recurring Engineering [Member] | Picor [Member]
Revenue									360
Royalties [Member]
Revenue									210
Royalties [Member] | BBU [Member]
Revenue									70
Royalties [Member] | Vi Chip [Member]
Revenue									70
Royalties [Member] | Picor [Member]
Revenue									70
Other [Member]
Revenue									71
Other [Member] | BBU [Member]
Revenue									0
Other [Member] | Vi Chip [Member]
Revenue									36
Other [Member] | Picor [Member]
Revenue									$ 35

X

- 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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