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Segment Information - Significant Segment Financial Data (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net revenues	$ 52,941	$ 56,119	$ 98,968	$ 120,136
Income (loss) from operations	(601)	793	(6,030)	4,403
Total assets	154,149	161,787	154,149	161,787	$ 157,545
Depreciation and amortization	2,116	2,320	4,311	4,723
Operating Segments [Member] | BBU [Member]
Segment Reporting Information [Line Items]
Net revenues	40,576	45,399	77,445	90,277
Income (loss) from operations	4,235	6,627	5,741	12,006
Total assets	190,135	157,170	190,135	157,170
Depreciation and amortization	1,149	1,152	2,268	2,305
Operating Segments [Member] | VI Chip [Member]
Segment Reporting Information [Line Items]
Net revenues	10,418	8,736	18,165	22,916
Income (loss) from operations	(4,508)	(5,284)	(10,216)	(8,772)
Total assets	19,583	16,138	19,583	16,138
Depreciation and amortization	545	717	1,129	1,516
Operating Segments [Member] | Picor [Member]
Segment Reporting Information [Line Items]
Net revenues	4,321	3,970	7,276	11,079
Income (loss) from operations	(133)	(374)	(1,137)	1,643
Total assets	6,111	5,658	6,111	5,658
Depreciation and amortization	135	98	262	195
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(195)	(176)	(418)	(474)
Total assets	71,513	85,119	71,513	85,119
Depreciation and amortization	287	353	652	707
Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues	(2,374)	(1,986)	(3,918)	(4,136)
Total assets	$ (133,193)	$ (102,298)	$ (133,193)	$ (102,298)

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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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