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Stockholders' Equity and Stock-Based Compensation (Tables)

6 Months Ended

Jun. 25, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Employee stock purchase plan assumptions

		Three Months Ended								Six Months Ended
		June 25, 2016				June 27, 2015				June 25, 2016				June 27, 2015
Employee Stock Purchase Plan:
Expected life		0.5 years				0.5 years				0.5 years				0.5 years
Volatility			39.1%				37.2%				39.1	%			37.2%
Risk free interest rate			0.49%				0.11%				0.49	%			0.11%
Dividends			—				—				—				—

Stock option plans activity

A summary of activity of stock options during the six months ended June 25, 2016 is as follows:

		Number of Shares Outstanding (Options)				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (Years)				Aggregate Intrinsic Value (in Thousands)
Options
Outstanding at December 26, 2015			1,051,867			$	14.60				2.46			$	1,916
Exercised			(254,922	)		$	12.60
Cancelled			(164,038	)		$	15.86
Outstanding at June 25, 2016			632,907			$	15.07				2.54			$	3,248
Exercisable at June 25, 2016			562,094			$	14.91				2.34			$	2,972

Summary of activity for RSUs

A summary of activity for RSUs is as follows:

Summary of activity for RSUs		Number of RSUs				Weighted Average Fair Value
Outstanding RSUs as of December 26, 2015			713,243			$	15.99
Granted			441,551			$	17.02
Released			(246,363	)		$	16.43
Cancelled			(32,945	)		$	15.18
Outstanding RSUs as of June 25, 2016			875,486			$	16.42

Summary of activity for PSUs

A summary of activity for PSUs is as follows:

Summary of activity for PSUs		Number of PSUs				Weighted Average Fair Value
Outstanding PSUs as of December 26, 2015			60,000			$	18.35
Granted			67,500			$	8.52
Released			(13,333	)		$	18.04
Cancelled			(6,667	)		$	18.04
Outstanding PSUs as of June 25, 2016			107,500			$	12.24

PSUs valuation assumptions

The assumptions for the valuation of PSUs are summarized as follows:

		2016 Award				2015 Award
Grant Date Fair Value Per Share		$	8.52			$	18.35
Weighted-average assumptions/inputs:
Expected Dividend			—				—
Range of risk-free interest rates			0.92%			0.25%-1.1%
Range of expected volatilities for peer group		22%-93%				23%-65%

Stock-based compensation expense for all share-based payment awards

Stock-based compensation expense for all share-based payment awards made to the Company’s employees and directors pursuant to the employee stock option and employee stock purchase plans by function were as follows (in thousands):

		Three Months Ended								Six Months Ended
		June 25, 2016				June 27, 2015				June 25, 2016				June 27, 2015
Cost of products		$	89			$	60			$	156			$	132
Cost of service			114				45				218				91
Research and development			313				215				598				496
Selling			463				393				955				892
General and administrative			764				698				1,505				1,371
Total stock-based compensation expense related to employee    stock options and employee stock purchases		$	1,743			$	1,411			$	3,432			$	2,982

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