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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		6 Months Ended
		Jul. 02, 2016 USD ($)	Jun. 27, 2015 USD ($)	Jul. 02, 2016 USD ($) segment	Jun. 27, 2015 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Number of Reportable Segments | segment				1
Revenue		$ 148,696	$ 148,788	$ 279,500	$ 266,749
Cost of revenue	[1]	79,044	78,755	147,887	143,008
Gross margin		69,652	70,033	131,613	123,741
Research and development	[1]	18,544	18,732	38,272	37,764
Selling and marketing	[1]	29,107	27,329	49,047	41,517
General and administrative	[1]	16,143	12,905	32,907	25,494
Other income (expense), net		1,419	(61)	1,619	(855)
Income before income taxes		$ 7,277	$ 11,006	$ 13,006	$ 18,111
[1] Total stock-based compensation recorded in the three and six months ended July 2, 2016 and June 27, 2015 included in the above figures breaks down by expense classification as follows: Three Months Ended Six Months Ended July 2, 2016 June 27, 2015 July 2, 2016 June 27, 2015Cost of revenue$150 $177 $371 392Research and development741 942 1,570 1,774Selling and marketing387 306 872 615General and administrative2,708 2,030 5,065 3,781

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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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