Stock-Based Compensation (Tables)

9 Months Ended

Sep. 29, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The stock-based compensation expense included in the Company's consolidated financial statements for the nine months ended September 29, 2013 and September 30, 2012 was as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 29, 2013		September 30, 2012		September 29, 2013		September 30, 2012
Cost of revenue	$	24	$	69	$	76	$	140
Research and development	74		147		286		339
Selling, general and administrative	232		385		705		940
Total costs and expenses	$	330	$	601	$	1,067	$	1,419

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following weighted average assumptions are included in the estimated fair value calculations for stock option grants:

	Three Months Ended				Nine Months Ended
	September 29, 2013		September 30, 2012		September 29, 2013		September 30, 2012
Expected term (years)	4.92		4.92		6.08		5.58
Risk-free interest rate	1.51	%	0.67	%	1.19	%	0.89	%
Expected volatility	62.62	%	65.56	%	60.53	%	62.59	%
Expected dividend yield	—		—		—		—

Schedule of Share-based Compensation, Activity

The following table summarizes the activity in the shares available for grant under the 2009 Plan during the first nine months of 2013:

	Shares Available for Grant
	(in thousands)
Balance at December 30, 2012	2,920
Options granted	(103	)
Options forfeited or expired	265
RSUs granted	(20	)
PRSUs forfeited or expired	25
Balance at September 29, 2013	3,087

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes stock options outstanding and stock option activity under the 1999 Plan and the 2009 Plan, and the related weighted average exercise price, for the first nine months of 2013:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Term	Aggregate Intrinsic Value
	(in thousands)				(in years)	(in thousands)
Balance outstanding at December 30, 2012	6,960		$	2.55
Granted	103		2.33
Forfeited or expired	(265	)	2.65
Exercised	(64	)	1.70
Balance outstanding at September 29, 2013	6,734		$	2.55	5.61	$	2,440
Exercisable at September 29, 2013	5,506		$	2.53	5.02	$	2,264
Vested and expected to vest at September 29, 2013	6,541		$	2.55	5.52	$	2,407

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity

A summary of activity for the Company's RSUs and PRSUs for the nine months ended September 29, 2013 and information regarding RSUs and PRSUs outstanding and expected to vest as of September 29, 2013 is as follows:

	RSUs & PRSUs Outstanding
	Number of Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Nonvested at December 30, 2012	40		$	2.30
Granted	20		2.33
Vested	(18	)	2.42
Forfeited	(25	)	—
Nonvested at September 29, 2013	17		$	2.26

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumption

The fair value of rights issued pursuant to the Company's 2009 ESPP was estimated on the commencement date of each offering period using the following weighted average assumptions:

	Three Months Ended				Nine Months Ended
	September 29, 2013		September 30, 2012		September 29, 2013		September 30, 2012
Expected term (months)	6.08		6.08		6.08		6.08
Risk-free interest rate	0.09	%	0.14	%	0.09	%	0.14	%
Volatility	39.03	%	67.93	%	39.03	%	67.93	%
Dividend yield	—		—		—		—