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Segment Information - Segment Financial Data (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net revenues	$ 65,269	$ 54,462
Income (loss) from operations	3,686	(1,378)
Total assets	173,630	156,571	$ 165,724
Depreciation and amortization	2,269	2,157
Operating Segments [Member] | BBU [Member]
Segment Reporting Information [Line Items]
Net revenues	40,637	37,535
Income (loss) from operations	1,039	1,420
Total assets	239,619	206,812
Depreciation and amortization	912	973
Operating Segments [Member] | VI Chip [Member]
Segment Reporting Information [Line Items]
Net revenues	20,881	12,922
Income (loss) from operations	1,081	(3,920)
Total assets	40,206	22,736
Depreciation and amortization	811	629
Operating Segments [Member] | Picor [Member]
Segment Reporting Information [Line Items]
Net revenues	8,221	6,858
Income (loss) from operations	2,022	1,368
Total assets	12,662	10,268
Depreciation and amortization	191	180
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(456)	(246)
Total assets	58,095	69,507
Depreciation and amortization	355	375
Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues	(4,470)	(2,853)
Total assets	$ (176,952)	$ (152,752)

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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
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+ References

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