Organization and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 29, 2017

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Customers as Percentage of Total Sales

The Company’s most significant customers (having accounted for 10% or more of sales) and their related sales as a percentage of total sales for each of the previous three years, were as follows:

	Fiscal Year Ended
	2017			2016			2015
Lam Research Corporation	59.8		%	53.3		%	50.6		%
Applied Materials, Inc.	24.6			28.9			26.4
Total		84.4	%		82.2	%		77.0	%

Assets or Liabilities Measured at Fair Value

The following table summarizes, for assets or liabilities measured at fair value, the respective fair value and the classification by level of input within the fair value hierarchy (in thousands):

			Fair Value Measurement at
			Reporting Date Using
Description	December 29, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Other assets:
Interest rate swap	$	30	$	—	$	30	$	—
Forward contracts	$	1,302	$	—	$	1,302	$	—

			Fair Value Measurement at
			Reporting Date Using
Description	December 30, 2016		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Other assets:
Interest rate swap	$	15	$	—	$	15	$	—
Other liabilities:
Interest rate swap	$	6	$	—	$	6	$	—
Contingent earn-out liability	$	278	$	—	$	—	$	278

Stock-Based Compensation Expense Included in Condensed Consolidated Statements of Operations

Total stock-based compensation during the fiscal years 2017, 2016 and 2015, respectively, to various expense categories was as follows (in thousands):

	Year Ended
	December 29,				December 30,				December 25,
	2017				2016				2015
Cost of goods sold (1)	$		1,499		$		1,254		$		1,175
Sales and marketing			617				463			414
Research and development		219				281				202
General and administrative			5,422				3,673				1,869
			7,757				5,671				3,660
Income tax benefit			(1,055	)			(2,660	)			(487	)
Net stock-based compensation expense	$		6,702		$		3,011		$		3,173

(1) Stock-based compensation expenses capitalized in inventory for fiscal years 2017, 2016 and 2015 were considered immaterial.