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Segment Information - Significant Segment Financial Data (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 58,771 | $ 56,888 | $ 57,709 | $ 54,462 | $ 48,085 | $ 53,227 | $ 52,941 | $ 46,027 | $ 227,830 | $ 200,280 | $ 220,194
Income (loss) from operations |  |  |  |  |  |  |  |  | (1,360) | (6,314) | (267)
Total assets | 165,724 |  |  |  | 154,067 |  |  |  | 165,724 | 154,067 | 157,545
Depreciation and amortization |  |  |  |  |  |  |  |  | 8,893 | 8,438 | 9,142
Operating Segments [Member] | BBU [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 151,789 | 151,428 | 173,064
Income (loss) from operations |  |  |  |  |  |  |  |  | 5,615 | 11,750 | 21,743
Total assets | 232,255 |  |  |  | 196,987 |  |  |  | 232,255 | 196,987 | 170,939
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,907 | 4,258 | 4,538
Operating Segments [Member] | VI Chip [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 61,330 | 39,947 | 36,688
Income (loss) from operations |  |  |  |  |  |  |  |  | (11,495) | (16,494) | (21,040)
Total assets | 34,809 |  |  |  | 21,389 |  |  |  | 34,809 | 21,389 | 15,577
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,782 | 2,235 | 2,740
Operating Segments [Member] | Picor [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 26,297 | 16,684 | 17,304
Income (loss) from operations |  |  |  |  |  |  |  |  | 5,400 | (637) | (290)
Total assets | 13,509 |  |  |  | 8,583 |  |  |  | 13,509 | 8,583 | 5,369
Depreciation and amortization |  |  |  |  |  |  |  |  | 747 | 545 | 442
Operating Segments [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | (880) | (933) | (680)
Total assets | 59,550 |  |  |  | 73,253 |  |  |  | 59,550 | 73,253 | 81,824
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,457 | 1,400 | 1,422
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | (11,586) | (7,779) | (6,862)
Total assets | $ (174,399) |  |  |  | $ (146,145) |  |  |  | $ (174,399) | $ (146,145) | $ (116,164)

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