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Revenue - Summary of Net Revenues Disaggregated by Geography (Detail) - USD ($) $ in Thousands | 3 Months Ended
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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
United States [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 29,241 | 25,623
United States [Member] | BBU [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 22,292 | 16,991
United States [Member] | VI Chip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6,237 | 7,999
United States [Member] | Picor [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 712 | 633
Europe [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6,995 | 5,373
Europe [Member] | BBU [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6,009 | 4,725
Europe [Member] | VI Chip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 923 | 573
Europe [Member] | Picor [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 63 | 75
Asia Pacific [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 28,011 | 33,356
Asia Pacific [Member] | BBU [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 17,111 | 18,211
Asia Pacific [Member] | VI Chip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 9,158 | 11,387
Asia Pacific [Member] | Picor [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,742 | 3,758
All Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,478 | 917
All Other [Member] | BBU [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,213 | 710
All Other [Member] | VI Chip [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 248 | 180
All Other [Member] | Picor [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 17 | $ 27

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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