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Revenue - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 65,725 | $ 65,269
BBU [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 46,625 | 40,637
VI Chip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 16,566 | 20,139
Picor [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,534 | 4,493
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 54,714 | 56,760
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | BBU [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 39,948 | 35,474
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | VI Chip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 12,803 | 17,306
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Picor [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,963 | 3,980
Stocking Distributors, Net of Sales Allowances [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 9,283 | 7,906
Stocking Distributors, Net of Sales Allowances [Member] | BBU [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6,117 | 4,963
Stocking Distributors, Net of Sales Allowances [Member] | VI Chip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,617 | 2,554
Stocking Distributors, Net of Sales Allowances [Member] | Picor [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 549 | 389
Non-recurring Engineering [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,673 | 510
Non-recurring Engineering [Member] | BBU [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 548 | 175
Non-recurring Engineering [Member] | VI Chip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,125 | 245
Non-recurring Engineering [Member] | Picor [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 90
Royalties [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 36 | 75
Royalties [Member] | BBU [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 12 | 25
Royalties [Member] | VI Chip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 12 | 25
Royalties [Member] | Picor [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 12 | 25
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 19 | 18
Other | BBU [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Other | VI Chip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 9 | 9
Other | Picor [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 10 | $ 9

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