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Segment Information - Segment Financial Data (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net revenues	$ 78,035	$ 56,888	$ 217,500	$ 169,059
Income (loss) from operations	13,043	100	25,045	(1,816)
Total assets	207,665	166,076	207,665	166,076	$ 165,724
Depreciation and amortization	2,331	2,244	6,870	6,590
BBU [Member]
Segment Reporting Information [Line Items]
Net revenues	51,026		140,012
VI Chip [Member]
Segment Reporting Information [Line Items]
Net revenues	20,728		60,757
Picor [Member]
Segment Reporting Information [Line Items]
Net revenues	6,281		16,731
Operating Segments [Member] | BBU [Member]
Segment Reporting Information [Line Items]
Net revenues	51,026	38,529	140,012	115,141
Income (loss) from operations	10,444	2,007	16,710	5,962
Total assets	268,520	227,408	268,520	227,408
Depreciation and amortization	858	971	2,652	2,944
Operating Segments [Member] | VI Chip [Member]
Segment Reporting Information [Line Items]
Net revenues	21,525	14,745	63,125	42,835
Income (loss) from operations	1,304	(2,952)	3,669	(10,761)
Total assets	44,262	33,021	44,262	33,021
Depreciation and amortization	913	712	2,560	2,000
Operating Segments [Member] | Picor [Member]
Segment Reporting Information [Line Items]
Net revenues	8,587	6,360	25,983	19,553
Income (loss) from operations	1,579	1,359	6,037	3,825
Total assets	13,500	11,934	13,500	11,934
Depreciation and amortization	200	188	587	558
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(284)	(314)	(1,371)	(842)
Total assets	83,865	64,864	83,865	64,864
Depreciation and amortization	360	373	1,071	1,088
Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues	(3,103)	(2,746)	(11,620)	(8,470)
Total assets	$ (202,482)	$ (171,151)	$ (202,482)	$ (171,151)

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