Segment Information - Segment Financial Data (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net revenues	$ 74,196	$ 57,709	$ 139,465	$ 112,171
Income (loss) from operations	8,316	(538)	12,002	(1,916)
Total assets	190,843	163,615	190,843	163,615	$ 165,724
Depreciation and amortization	2,270	2,189	4,539	4,346
BBU [Member]
Segment Reporting Information [Line Items]
Net revenues	48,349		88,986
VI Chip [Member]
Segment Reporting Information [Line Items]
Net revenues	19,890		40,029
Picor [Member]
Segment Reporting Information [Line Items]
Net revenues	5,957		10,450
Operating Segments [Member] \| BBU [Member]
Segment Reporting Information [Line Items]
Net revenues	48,349	39,077	88,986	76,612
Income (loss) from operations	5,227	2,535	6,266	3,955
Total assets	265,952	219,195	265,952	219,195
Depreciation and amortization	882	1,000	1,794	1,973
Operating Segments [Member] \| VI Chip [Member]
Segment Reporting Information [Line Items]
Net revenues	20,719	15,168	41,600	28,090
Income (loss) from operations	1,284	(3,889)	2,365	(7,809)
Total assets	40,845	27,621	40,845	27,621
Depreciation and amortization	836	659	1,647	1,288
Operating Segments [Member] \| Picor [Member]
Segment Reporting Information [Line Items]
Net revenues	9,175	6,335	17,396	13,193
Income (loss) from operations	2,436	1,098	4,458	2,466
Total assets	12,756	11,287	12,756	11,287
Depreciation and amortization	196	190	387	370
Operating Segments [Member] \| Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(631)	(282)	(1,087)	(528)
Total assets	69,889	67,764	69,889	67,764
Depreciation and amortization	356	340	711	715
Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues	(4,047)	(2,871)	(8,517)	(5,724)
Total assets	$ (198,599)	$ (162,252)	$ (198,599)	$ (162,252)

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.

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