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Significant Accounting Policies -Summary of Net Revenues Disaggregated by Geography (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
United States [Member]
Revenue									110,779	83,871	80,603
United States [Member] | BBU [Member]
Revenue									77,995
United States [Member] | Vi Chip [Member]
Revenue									30,118
United States [Member] | Picor [Member]
Revenue									2,666
Europe [Member]
Revenue									27,689	24,078	22,495
Europe [Member] | BBU [Member]
Revenue									23,484
Europe [Member] | Vi Chip [Member]
Revenue									3,883
Europe [Member] | Picor [Member]
Revenue									322
Asia Pacific [Member]
Revenue									147,078	114,365	91,848
Asia Pacific [Member] | BBU [Member]
Revenue									80,097
Asia Pacific [Member] | Vi Chip [Member]
Revenue									47,174
Asia Pacific [Member] | Picor [Member]
Revenue									19,807
All Other [Member]
Revenue									5,674	$ 5,516	$ 5,334
All Other [Member] | BBU [Member]
Revenue									5,128
All Other [Member] | Vi Chip [Member]
Revenue									499
All Other [Member] | Picor [Member]
Revenue									$ 47

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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