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.

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

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

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

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The net result for the period of deducting operating expenses from operating revenues.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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

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Segment Information - Significant Segment Financial Data (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net revenues	$ 60,735us-gaap_SalesRevenueNet	$ 58,402us-gaap_SalesRevenueNet	$ 53,361us-gaap_SalesRevenueNet	$ 53,233us-gaap_SalesRevenueNet	$ 55,258us-gaap_SalesRevenueNet	$ 55,091us-gaap_SalesRevenueNet	$ 46,865us-gaap_SalesRevenueNet	$ 41,946us-gaap_SalesRevenueNet	$ 225,731us-gaap_SalesRevenueNet	$ 199,160us-gaap_SalesRevenueNet	$ 218,507us-gaap_SalesRevenueNet
Income (loss) from operations									(14,763)us-gaap_OperatingIncomeLoss	(20,467)us-gaap_OperatingIncomeLoss	(2,785)us-gaap_OperatingIncomeLoss
Total assets	155,542us-gaap_Assets				165,640us-gaap_Assets				155,542us-gaap_Assets	165,640us-gaap_Assets	202,581us-gaap_Assets
Depreciation and amortization									9,805	10,008	10,423
Operating Segments [Member] \| BBU [Member]
Segment Reporting Information [Line Items]
Net revenues									184,224	163,013	179,919
Income (loss) from operations									15,499	12,062	28,114
Total assets	151,923				126,585				151,923	126,585	97,507
Depreciation and amortization									4,711	6,185	4,958
Operating Segments [Member] \| VI Chip [Member]
Segment Reporting Information [Line Items]
Net revenues									34,701	35,333	38,083
Income (loss) from operations									(29,015)	(28,204)	(27,409)
Total assets	17,677				21,370				17,677	21,370	21,105
Depreciation and amortization									3,265	3,232	3,568
Operating Segments [Member] \| Picor [Member]
Segment Reporting Information [Line Items]
Net revenues									15,570	10,416	9,724
Income (loss) from operations									(407)	(3,326)	(2,786)
Total assets	5,691				4,308				5,691	4,308	5,365
Depreciation and amortization									410	407	414
Operating Segments [Member] \| Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations									(840)	(999)	(704)
Total assets	75,758				81,364				75,758	81,364	119,007
Depreciation and amortization									1,419	184	1,483
Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues									(8,764)	(9,602)	(9,219)
Total assets	$ (95,507)				$ (67,987)				$ (95,507)	$ (67,987)	$ (40,403)