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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 942
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-Section S99
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 28
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Segment Information - Significant Segment Financial Data (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net revenues	$ 58,771	$ 56,888	$ 57,709	$ 54,462	$ 48,085	$ 53,227	$ 52,941	$ 46,027	$ 227,830	$ 200,280	$ 220,194
Income (loss) from operations									(1,360)	(6,314)	(267)
Total assets	165,724				154,067				165,724	154,067	157,545
Depreciation and amortization									8,893	8,438	9,142
Operating Segments [Member] \| BBU [Member]
Segment Reporting Information [Line Items]
Net revenues									151,789	151,428	173,064
Income (loss) from operations									5,615	11,750	21,743
Total assets	232,255				196,987				232,255	196,987	170,939
Depreciation and amortization									3,907	4,258	4,538
Operating Segments [Member] \| VI Chip [Member]
Segment Reporting Information [Line Items]
Net revenues									61,330	39,947	36,688
Income (loss) from operations									(11,495)	(16,494)	(21,040)
Total assets	34,809				21,389				34,809	21,389	15,577
Depreciation and amortization									2,782	2,235	2,740
Operating Segments [Member] \| Picor [Member]
Segment Reporting Information [Line Items]
Net revenues									26,297	16,684	17,304
Income (loss) from operations									5,400	(637)	(290)
Total assets	13,509				8,583				13,509	8,583	5,369
Depreciation and amortization									747	545	442
Operating Segments [Member] \| Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations									(880)	(933)	(680)
Total assets	59,550				73,253				59,550	73,253	81,824
Depreciation and amortization									1,457	1,400	1,422
Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues									(11,586)	(7,779)	(6,862)
Total assets	$ (174,399)				$ (146,145)				$ (174,399)	$ (146,145)	$ (116,164)