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Segment Information - Segment Financial Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Net revenues $ 48,664 $ 58,402 $ 168,800 $ 164,996  
Income (loss) from operations (2,218) (4,132) 2,185 (14,585)  
Total assets 163,275 158,719 163,275 158,719 $ 155,542
Depreciation and amortization 2,231 2,459 6,954 7,313  
Operating Segments [Member] | BBU [Member]          
Segment Reporting Information [Line Items]          
Net revenues 41,119 45,972 131,396 137,546  
Income (loss) from operations 5,612 2,369 17,618 10,030  
Total assets 163,801 149,125 163,801 149,125  
Depreciation and amortization 1,119 1,155 3,424 3,506  
Operating Segments [Member] | VI Chip [Member]          
Segment Reporting Information [Line Items]          
Net revenues 6,023 10,321 28,939 24,296  
Income (loss) from operations (6,564) (6,429) (15,336) (22,682)  
Total assets 15,372 18,876 15,372 18,876  
Depreciation and amortization 633 850 2,150 2,429  
Operating Segments [Member] | Picor [Member]          
Segment Reporting Information [Line Items]          
Net revenues 2,791 4,081 13,870 9,698  
Income (loss) from operations (1,169) 156 474 (1,371)  
Total assets 4,796 4,945 4,796 4,945  
Depreciation and amortization 123 103 318 309  
Operating Segments [Member] | Corporate [Member]          
Segment Reporting Information [Line Items]          
Income (loss) from operations (97) (228) (571) (562)  
Total assets 88,142 77,397 88,142 77,397  
Depreciation and amortization 356 351 1,062 1,069  
Eliminations [Member]          
Segment Reporting Information [Line Items]          
Net revenues (1,269) (1,972) (5,405) (6,544)  
Total assets $ (108,836) $ (91,624) $ (108,836) $ (91,624)