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Segment Information - Significant Segment Financial Data (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | $ 58,402 | $ 55,091 | $ 164,996 | $ 143,902 |
Income (loss) from operations | (4,132) | (1,355) | (14,585) | (16,833) |
Total assets | 158,719 | 180,878 | 158,719 | 180,878 | 165,640
Depreciation and amortization | 2,459 | 2,527 | 7,313 | 7,555 |
Operating Segments [Member] | BBU [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | 45,972 | 42,331 | 137,546 | 120,743 |
Income (loss) from operations | 2,369 | 5,162 | 10,030 | 9,752 |
Total assets | 149,125 | 119,739 | 149,125 | 119,739 |
Depreciation and amortization | 1,155 | 1,296 | 3,506 | 3,773 |
Operating Segments [Member] | VI Chip [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | 10,321 | 12,457 | 24,296 | 22,503 |
Income (loss) from operations | (6,429) | (5,555) | (22,682) | (23,142) |
Total assets | 18,876 | 19,898 | 18,876 | 19,898 |
Depreciation and amortization | 850 | 760 | 2,429 | 2,468 |
Operating Segments [Member] | Picor [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | 4,081 | 2,836 | 9,698 | 7,426 |
Income (loss) from operations | 156 | (696) | (1,371) | (2,711) |
Total assets | 4,945 | 4,345 | 4,945 | 4,345 |
Depreciation and amortization | 103 | 96 | 309 | 315 |
Operating Segments [Member] | Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income (loss) from operations | (228) | (266) | (562) | (732) |
Total assets | 77,397 | 98,614 | 77,397 | 98,614 |
Depreciation and amortization | 351 | 375 | 1,069 | 999 |
Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | (1,972) | (2,533) | (6,544) | (6,770) |
Total assets | $ (91,624) | $ (61,718) | $ (91,624) | $ (61,718) |

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