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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
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Sep. 30, 2017 USD ($) | Oct. 01, 2016 USD ($) | Sep. 30, 2017 USD ($) segment | Oct. 01, 2016 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Number of Reportable Segments | segment |  |  |  | 1 |
Revenue |  | $ 205,399 | $ 168,610 | $ 557,014 | $ 448,110
Cost of revenue | [1] | 103,016 | 87,550 | 277,397 | 235,437
Gross margin |  | 102,383 | 81,060 | 279,617 | 212,673
Research and development | [1] | 28,843 | 19,672 | 80,518 | 57,944
Selling and marketing | [1] | 28,646 | 17,925 | 91,344 | 66,972
General and administrative | [1] | 21,002 | 16,012 | 58,137 | 48,919
Other income, net |  | 2,601 | 523 | 4,290 | 2,142
Income before income taxes |  | $ 26,493 | $ 27,974 | $ 53,908 | $ 40,980
[1] | Total stock-based compensation recorded in the three and nine months ended September 30, 2017 and October 1, 2016 included in the above figures breaks down by expense classification as follows: Three Months Ended Nine Months Ended September 30, 2017 October 1, 2016 September 30, 2017 October 1, 2016Cost of revenue$274 $184 $751 $555Research and development1,261 1,028 3,508 2,598Selling and marketing728 444 1,869 1,316General and administrative2,771 2,247 7,941 7,312

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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