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Segment Information - Significant Segment Financial Data (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 51,394 | $ 48,664 | $ 56,119 | $ 64,017 | $ 60,735 | $ 58,402 | $ 53,361 | $ 53,233 | $ 220,194 | $ 225,731 | $ 199,160
Income (loss) from operations |  |  |  |  |  |  |  |  | (267) | (14,763) | (20,467)
Total assets | 157,545 |  |  |  | 155,542 |  |  |  | 157,545 | 155,542 | 165,640
Depreciation and amortization |  |  |  |  |  |  |  |  | 9,142 | 9,805 | 10,008
Operating Segments [Member] | BBU [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 173,064 | 184,224 | 163,013
Income (loss) from operations |  |  |  |  |  |  |  |  | 21,743 | 15,499 | 12,062
Total assets | 170,939 |  |  |  | 151,923 |  |  |  | 170,939 | 151,923 | 126,585
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,538 | 4,711 | 6,185
Operating Segments [Member] | VI Chip [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 36,688 | 34,701 | 35,333
Income (loss) from operations |  |  |  |  |  |  |  |  | (21,040) | (29,015) | (28,204)
Total assets | 15,577 |  |  |  | 17,677 |  |  |  | 15,577 | 17,677 | 21,370
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,740 | 3,265 | 3,232
Operating Segments [Member] | Picor [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 17,304 | 15,570 | 10,416
Income (loss) from operations |  |  |  |  |  |  |  |  | (290) | (407) | (3,326)
Total assets | 5,369 |  |  |  | 5,691 |  |  |  | 5,369 | 5,691 | 4,308
Depreciation and amortization |  |  |  |  |  |  |  |  | 442 | 410 | 407
Operating Segments [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | (680) | (840) | (999)
Total assets | 81,824 |  |  |  | 75,758 |  |  |  | 81,824 | 75,758 | 81,364
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,422 | 1,419 | 184
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | (6,862) | (8,764) | (9,602)
Total assets | $ (116,164) |  |  |  | $ (95,507) |  |  |  | $ (116,164) | $ (95,507) | $ (67,987)

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