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Significant Accounting Policies -Summary of Net Revenues Disaggregated by Category (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
Revenue | $ 73,720 | $ 78,035 | $ 74,196 | $ 65,269 | $ 58,771 | $ 56,888 | $ 57,709 | $ 54,462 | $ 291,220 | $ 227,830 | $ 200,280
BBU [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 186,704 |  |
Vi Chip [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 81,674 |  |
Picor [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 22,842 |  |
Direct Customers Contract Manufacturers And Non stocking Distributors [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 254,785 |  |
Direct Customers Contract Manufacturers And Non stocking Distributors [Member] | BBU [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 163,206 |  |
Direct Customers Contract Manufacturers And Non stocking Distributors [Member] | Vi Chip [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 70,919 |  |
Direct Customers Contract Manufacturers And Non stocking Distributors [Member] | Picor [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 20,660 |  |
Stocking Distributors Net Of Sales Allowances [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 31,732 |  |
Stocking Distributors Net Of Sales Allowances [Member] | BBU [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 22,362 |  |
Stocking Distributors Net Of Sales Allowances [Member] | Vi Chip [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 7,653 |  |
Stocking Distributors Net Of Sales Allowances [Member] | Picor [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,717 |  |
Non recurring Engineering [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,422 |  |
Non recurring Engineering [Member] | BBU [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,066 |  |
Non recurring Engineering [Member] | Vi Chip [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,996 |  |
Non recurring Engineering [Member] | Picor [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 360 |  |
Royalties [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 210 |  |
Royalties [Member] | BBU [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 70 |  |
Royalties [Member] | Vi Chip [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 70 |  |
Royalties [Member] | Picor [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 70 |  |
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 71 |  |
Other [Member] | BBU [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 |  |
Other [Member] | Vi Chip [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 36 |  |
Other [Member] | Picor [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 35 |  |

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