Organization and Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 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 were as follows:

	Three Months Ended
	March 31,			March 25,
	2017			2016
Lam Research Corporation		58.7	%		56.6	%
Applied Materials, Inc.		26.9			23.1
Total		85.6	%		79.7	%

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	March 31, 2017		QuotedPrices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Other assets:
Interest rate swap	$	35	$	—	$	35	$	—
Other liabilities:
Interest rate swap	$	5	$	—	$	5	$	—
Contingent earn-out liability	$	587	$	—	$	—	$	587

			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

Schedule of Option Activity

Stock option activity for the three months ended March 31, 2017:

	Shares			Weighted Average Exercise Price		Weighted Remaining Contractual Life (years)		Aggregate IntrinsicValue (in thousands)
Outstanding at December 30, 2016		136,459		$	13.15		0.57	$	135
Granted		—
Exercised		(96,362	)		14.31
Cancelled		(6,500	)		14.17
Outstanding at March 31, 2017		33,597		$	9.62		0.81	$	243
Options exercisable at March 31, 2017		33,597		$	9.62		0.81	$	243

Summary of Restricted Stock Unit and Restricted Stock Award Activity

The following table summarizes the Company’s RSU and RSA activity for the three months ended March 31, 2017:

	Shares			Aggregate FairValue (in thousands)
Unvested restricted stock units and restricted stock awards    at December 30, 2016		1,757,507		$	16,466
Granted		—
Vested		(489,092	)
Forfeited		(14,658	)
Unvested restricted stock units and restricted stock awards    at March 31, 2017		1,253,757		$	20,139
Vested and expected to vest restricted stock units and    restricted stock awards at March 31, 2017		1,052,360		$	16,741

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

The following table shows the Company’s stock-based compensation expense included in the Condensed Consolidated Statements of Operations (in thousands):

	Three Months Ended
	March 31,		March 25,
	2017		2016
Cost of sales (1)	$	343	$	276
Research and development		53		61
Sales and marketing		124		77
General and administrative		862		651
		1,382		1,065
Income tax benefit		(330)		—
Stock-based compensation expense, net of tax	$	1,052	$	1,065

(1) Stock-based compensation expenses capitalized in inventory for the three months ended March 31, 2017 and March 25, 2016 were not significant.