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Industry Segment, Geographic Information and Significant Customers - Segment Information about Revenue, Cost of Revenue, Gross Margin and Income before Income Taxes (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 26, 2020 USD ($) | Sep. 28, 2019 USD ($) | Sep. 26, 2020 USD ($) segment | Sep. 28, 2019 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Number of Reportable Segments | segment |  |  | 1 |
Total cost of revenue | $ 214,304 | $ 152,558 | $ 430,755 | $ 412,675
Gross profit | 198,841 | 136,841 | 454,808 | 374,557
Research and development | 38,613 | 33,401 | 111,929 | 104,320
Selling and marketing | 50,488 | 42,257 | 136,144 | 137,502
General and administrative | 28,490 | 18,372 | 74,919 | 61,871
Other income, net | $ 42,240 | $ 900 | $ 41,837 | $ 3,713
Amazon [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Concentration Risk, Percentage | 26.60% | 29.60% | 26.40% | 25.00%

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