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Segment Information - Significant Segment Financial Data (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  | $ 73,720 | $ 78,035 | $ 74,196 | $ 65,269 | $ 58,771 | $ 56,888 | $ 57,709 | $ 54,462 | $ 291,220 | $ 227,830 | $ 200,280
Income (loss) from operations |  |  |  |  |  |  |  |  |  | 32,059 | (1,360) | (6,314)
Total assets |  | 221,068 |  |  |  | 165,724 |  |  |  | 221,068 | 165,724 | 154,067
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 9,254 | 8,893 | 8,438
Capital expenditures |  |  |  |  |  |  |  |  |  | 18,211 | 12,545 | 8,428
BBU [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | 186,704 |  |
VI Chip [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | 81,674 |  |
Picor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | 22,842 |  |
Operating Segments [Member] | BBU [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | 186,715 | 151,789 | 151,428
Income (loss) from operations |  |  |  |  |  |  |  |  |  | 22,544 | 5,615 | 11,750
Total assets |  | 279,671 |  |  |  | 232,255 |  |  |  | 279,671 | 232,255 | 196,987
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 3,621 | 3,907 | 4,258
Capital expenditures |  |  |  |  |  |  |  |  |  | 2,954 | 3,188 | 2,325
Operating Segments [Member] | VI Chip [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | 84,728 | 61,330 | 39,947
Income (loss) from operations |  |  |  |  |  |  |  |  |  | 3,612 | (11,495) | (16,494)
Total assets |  | 56,619 |  |  |  | 34,809 |  |  |  | 56,619 | 34,809 | 21,389
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 3,504 | 2,782 | 2,235
Capital expenditures |  |  |  |  |  |  |  |  |  | 13,386 | 7,505 | 4,041
Operating Segments [Member] | Picor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | 34,552 | 26,297 | 16,684
Income (loss) from operations |  |  |  |  |  |  |  |  |  | 7,517 | 5,400 | (637)
Total assets |  | 14,869 |  |  |  | 13,509 |  |  |  | 14,869 | 13,509 | 8,583
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 792 | 747 | 545
Capital expenditures |  |  |  |  |  |  |  |  |  | 621 | 1,249 | 1,178
Operating Segments [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  |  | (1,614) | (880) | (933)
Total assets |  | 85,851 |  |  |  | 59,550 |  |  |  | 85,851 | 59,550 | 73,253
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,337 | 1,457 | 1,400
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,250 | 603 | 884
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [1] |  |  |  |  |  |  |  |  | (14,775) | (11,586) | (7,779)
Total assets | [1] | $ (215,942) |  |  |  | $ (174,399) |  |  |  | $ (215,942) | $ (174,399) | $ (146,145)
[1] | The elimination for net revenues is principally related to inter-segment revenues of Picor to BBU and VI Chip and for inter-segment revenues of 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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