Equity and Stock Based Compensation Plans (Tables)

6 Months Ended

Jun. 29, 2013

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Assumption of stock option's fair value

	Three Months Ended				Six Months Ended
	June 29, 2013		June 30, 2012		June 29, 2013		June 30, 2012
Stock Options
Expected life	4.6 years		4.2 years		4.5 years		4.5 years
Volatility	68.90	%	78.65	%	72.32	%	78.23	%
Risk free interest rate	1.02	%	0.74	%	0.90	%	0.85	%
Dividends	—		—		—		—
Employee Stock Purchase Plan
Expected life	0.5 years		0.5 years		0.5 years		0.5 years
Volatility	25.94	%	55.93	%	27.61	%	62.74	%
Risk free interest rate	0.10	%	0.06	%	0.11	%	0.06	%
Dividends	—		—		—		—

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 29, 2013		June 30, 2012		June 29, 2013		June 30, 2012
Cost of products	$	53	$	20	$	98	$	77
Cost of service	71		75		130		133
Research and development	362		347		679		666
Selling	501		481		941		922
General and administrative	764		670		1,360		1,256
Total stock-based compensation expense	$	1,751	$	1,593	$	3,208	$	3,054

Changes in accumulated other comprehensive income by component

The following table shows a summary of changes in accumulated other comprehensive income by component for the six months ended June 29, 2013 (in thousands):

	Defined Benefit Pension Plans			Foreign Currency Translations			Unrealized Gain (Loss) on Investment			Total
Balance as of December 29, 2012	$	(179	)	$	1,453		$	(2	)	$	1,272
Other comprehensive income	—			(1,979		)	(3		)	(1,982		)
Balance as of June 29, 2013	$	(179	)	$	(526	)	$	(5	)	$	(710	)

Stock Options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock option plans activity

A summary of activity under the Company’s stock option plans during the six month period ended June 29, 2013, 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 29, 2012	2,020,319		$	12.01	4.44	$	6,770
Exercised	(181,617	)	7.15
Granted	314,100		15.31
Cancelled	(67,037	)	14.63
Outstanding at June 29, 2013	2,085,765		$	12.85	4.35	$	5,757
Exercisable at June 29, 2013	1,234,828		$	11.25	3.56	$	5,127

Restricted Stock Units (RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock option plans activity

A summary of activity for RSUs during the six month period ended June 29, 2013, is as follows:

	Number of RSUs		Weighted Average Fair Value
Outstanding RSU as of December 29, 2012	235,162		$	16.32
Granted	286,060		15.43
Released	(29,739	)	14.62
Cancelled	(8,518	)	14.27
Outstanding RSU as of June 29, 2013	482,965		$	14.67