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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. 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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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.

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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.

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