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Segment Information - Segment Financial Data (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net revenues	$ 57,709	$ 52,941	$ 112,171	$ 98,968
Income (loss) from operations	(538)	(601)	(1,916)	(6,030)
Total assets	163,615	154,149	163,615	154,149	$ 154,067
Depreciation and amortization	2,189	2,116	4,346	4,311
Operating Segments [Member] | BBU [Member]
Segment Reporting Information [Line Items]
Net revenues	39,077	40,576	76,612	77,445
Income (loss) from operations	2,535	4,235	3,955	5,741
Total assets	219,195	190,135	219,195	190,135
Depreciation and amortization	1,000	1,149	1,973	2,268
Operating Segments [Member] | VI Chip [Member]
Segment Reporting Information [Line Items]
Net revenues	15,168	10,418	28,090	18,165
Income (loss) from operations	(3,889)	(4,508)	(7,809)	(10,216)
Total assets	27,621	19,583	27,621	19,583
Depreciation and amortization	659	545	1,288	1,129
Operating Segments [Member] | Picor [Member]
Segment Reporting Information [Line Items]
Net revenues	6,335	4,321	13,193	7,276
Income (loss) from operations	1,098	(133)	2,466	(1,137)
Total assets	11,287	6,111	11,287	6,111
Depreciation and amortization	190	135	370	262
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(282)	(195)	(528)	(418)
Total assets	67,764	71,513	67,764	71,513
Depreciation and amortization	340	287	715	652
Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues	(2,871)	(2,374)	(5,724)	(3,918)
Total assets	$ (162,252)	$ (133,193)	$ (162,252)	$ (133,193)

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Section S99
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
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