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Segment Information - Significant Segment Financial Data (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net revenues	$ 46,027	$ 64,017
Income (loss) from operations	(5,429)	3,610
Total assets	151,910	161,273	$ 157,545
Depreciation and amortization	2,195	2,403
Operating Segments [Member] | BBU [Member]
Segment Reporting Information [Line Items]
Net revenues	36,869	44,878
Income (loss) from operations	1,506	5,379
Total assets	176,502	155,737
Depreciation and amortization	1,119	1,153
Operating Segments [Member] | VI Chip [Member]
Segment Reporting Information [Line Items]
Net revenues	7,747	14,180
Income (loss) from operations	(5,708)	(3,488)
Total assets	17,247	17,125
Depreciation and amortization	584	799
Operating Segments [Member] | Picor [Member]
Segment Reporting Information [Line Items]
Net revenues	2,955	7,109
Income (loss) from operations	(1,004)	2,017
Total assets	5,724	7,489
Depreciation and amortization	126	97
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(223)	(298)
Total assets	77,569	79,483
Depreciation and amortization	366	354
Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues	(1,544)	(2,150)
Total assets	$ (125,132)	$ (98,561)

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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 210
-SubTopic 10
-Section S99
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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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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