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Segment Information - Significant Segment Financial Data (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 55,258 | $ 55,091 | $ 46,865 | $ 41,946 | $ 50,424 | $ 52,948 | $ 55,467 | $ 59,668 | $ 199,160 | $ 218,507 | $ 252,968
Income (loss) from operations |  |  |  |  |  |  |  |  | (20,467) | (2,785) | 13,686
Total assets | 165,640 |  |  |  | 202,581 |  |  |  | 165,640 | 202,581 | 208,141
Depreciation and amortization |  |  |  |  |  |  |  |  | 10,008 | 10,423 | 11,005
Operating Segments [Member] | BBU [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 163,013 | 179,919 | 194,830
Income (loss) from operations |  |  |  |  |  |  |  |  | 12,062 | 28,114 | 31,938
Total assets | 126,585 |  |  |  | 97,507 |  |  |  | 126,585 | 97,507 | 82,096
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,185 | 4,958 | 5,503
Operating Segments [Member] | VI Chip [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 35,333 | 38,083 | 55,154
Income (loss) from operations |  |  |  |  |  |  |  |  | (28,204) | (27,409) | (16,294)
Total assets | 21,370 |  |  |  | 21,105 |  |  |  | 21,370 | 21,105 | 30,701
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,232 | 3,568 | 3,570
Operating Segments [Member] | Picor [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 10,416 | 9,724 | 13,183
Income (loss) from operations |  |  |  |  |  |  |  |  | (3,326) | (2,786) | (1,239)
Total assets | 4,308 |  |  |  | 5,365 |  |  |  | 4,308 | 5,365 | 7,098
Depreciation and amortization |  |  |  |  |  |  |  |  | 407 | 414 | 458
Operating Segments [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | (999) | (704) | (719)
Total assets | 81,364 |  |  |  | 119,007 |  |  |  | 81,364 | 119,007 | 119,231
Depreciation and amortization |  |  |  |  |  |  |  |  | 184 | 1,483 | 1,474
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | (9,602) | (9,219) | (10,199)
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |
Total assets | (67,987) |  |  |  | (40,403) |  |  |  | (67,987) | (40,403) | (30,985)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |

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