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Segment Information - Significant Segment Financial Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]          
Net revenues $ 53,227 $ 48,664 $ 152,195 $ 168,800  
Income (loss) from operations 2,273 (2,218) (3,757) 2,185  
Total assets 155,038 163,275 155,038 163,275 $ 157,545
Depreciation and amortization 2,073 2,231 6,384 6,954  
Operating Segments [Member] | BBU [Member]          
Segment Reporting Information [Line Items]          
Net revenues 38,518 41,119 115,963 131,396  
Income (loss) from operations 3,734 5,612 9,475 17,618  
Total assets 193,115 163,801 193,115 163,801  
Depreciation and amortization 1,025 1,119 3,293 3,424  
Operating Segments [Member] | VI Chip [Member]          
Segment Reporting Information [Line Items]          
Net revenues 11,961 6,023 30,126 28,939  
Income (loss) from operations (1,915) (6,564) (12,131) (15,336)  
Total assets 21,453 15,372 21,453 15,372  
Depreciation and amortization 531 633 1,660 2,150  
Operating Segments [Member] | Picor [Member]          
Segment Reporting Information [Line Items]          
Net revenues 5,320 2,791 12,596 13,870  
Income (loss) from operations 627 (1,169) (510) 474  
Total assets 6,928 4,796 6,928 4,796  
Depreciation and amortization 142 123 404 318  
Operating Segments [Member] | Corporate [Member]          
Segment Reporting Information [Line Items]          
Income (loss) from operations (173) (97) (591) (571)  
Total assets 72,521 88,142 72,521 88,142  
Depreciation and amortization 375 356 1,027 1,062  
Eliminations [Member]          
Segment Reporting Information [Line Items]          
Net revenues (2,572) (1,269) (6,490) (5,405)  
Total assets $ (138,979) $ (108,836) $ (138,979) $ (108,836)