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Segment Information - Significant Segment Financial Data (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |
Net revenues |  | $ 65,725 | $ 65,269 |
Income (loss) from operations |  | 4,493 | 3,686 |
Total assets |  | 225,004 | 173,630 | $ 221,068
Depreciation and amortization |  | 2,445 | 2,269 |
Capital expenditures |  | 3,322 | 1,858 |
BBU [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues |  | 46,625 | 40,637 |
VI Chip [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues |  | 16,566 | 20,139 |
Picor [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues |  | 2,534 | 4,493 |
Operating Segments [Member] | BBU [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues |  | 47,673 | 40,637 |
Income (loss) from operations |  | 6,055 | 1,039 |
Total assets |  | 287,891 | 239,619 |
Depreciation and amortization |  | 885 | 912 |
Capital expenditures |  | 1,175 | 399 |
Operating Segments [Member] | VI Chip [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues |  | 18,429 | 20,881 |
Income (loss) from operations |  | 100 | 1,081 |
Total assets |  | 50,975 | 40,206 |
Depreciation and amortization |  | 1,011 | 811 |
Capital expenditures |  | 1,809 | 1,290 |
Operating Segments [Member] | Picor [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues |  | 3,272 | 8,221 |
Income (loss) from operations |  | (1,310) | 2,022 |
Total assets |  | 15,614 | 12,662 |
Depreciation and amortization |  | 193 | 191 |
Capital expenditures |  | 338 | 169 |
Operating Segments [Member] | Corporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income (loss) from operations |  | (352) | (456) |
Total assets |  | 84,259 | 58,095 |
Depreciation and amortization |  | 356 | 355 |
Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues | [1] | (3,649) | (4,470) |
Total assets | [1] | $ (213,735) | $ (176,952) |
[1] | The elimination for net revenues is principally related to inter-segment sales by Picor to BBU and VI Chip and for inter-segment sales by VI Chip to BBU. The elimination for total assets is principally related to inter-segment accounts receivable due to BBU for the funding of VI Chip and Picor operations.

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