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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 27, 2015

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

Schedule of stock based compensation expense

The stock-based compensation expense included in the Company's consolidated financial statements for the three and nine months ended September 27, 2015 and September 28, 2014 was as follows (in thousands):



	Three Months Ended				Nine Months Ended
	September 27, 2015		September 28, 2014		September 27, 2015		September 28, 2014
Cost of revenue	$	29	$	32	$	95	$	110
Research and development	210		176		613		750
Selling, general and administrative	240		244		759		890
Restructuring charges*	29		—		29		—
Total costs and expenses	$	508	$	452	$	1,496	$	1,750

No stock-based compensation was capitalized during any period presented above.

* Stock-based compensation related to restructuring plan initiated in Q2-15.

Schedule of weighted average assumptions included in the estimated fair value calculations for stock option grants

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



	Three Months Ended				Nine Months Ended
	September 27, 2015		September 28, 2014		September 27, 2015		September 28, 2014
Expected term (years)	4.78		6.19		4.78		6.19
Risk-free interest rate	1.40	%	1.98	%	1.40	%	1.98	%
Expected volatility	52.11	%	55.10	%	52.11	%	55.10	%
Expected dividend yield	—		—		—		—

Summary of the activity in the shares available for grant under the 2009 plan

The following table summarizes the activity in the shares available for grant under the 2009 Plan during the nine months ended September 27, 2015:



	Shares Available for Grant
	(in thousands)
Balance at December 28, 2014	1,139
Authorized	2,500
Options granted	(80	)
Options forfeited or expired	495
RSUs granted	(301	)
PRSUs granted	(21	)
RSUs forfeited or expired	52
Balance at September 27, 2015	3,784

Summary of stock options outstanding and stock option activity under the 1999 plan and the 2009 plan, and the related weighted average exercise price

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 2015:



	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Term	Aggregate Intrinsic Value
	(in thousands)				(in years)	(in thousands)
Balance outstanding at December 28, 2014	5,682		$	2.67
Granted	80		2.00
Forfeited or expired	(495	)	2.86
Exercised	(119	)	0.98
Balance outstanding at September 27, 2015	5,148		$	2.68	4.84	$	322
Exercisable at September 27, 2015	4,424		$	2.62	4.27	$	322
Vested and expected to vest at September 27, 2015	5,148		$	2.68	4.84	$	322

Summary of activity for RSUs and PRSUs

A summary of activity for the Company's RSUs and PRSUs for the nine months ended September 27, 2015 and information regarding RSUs and PRSUs outstanding and expected to vest as of September 27, 2015 is as follows:



	RSUs & PRSUs Outstanding
	Number of Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Nonvested at December 28, 2014	650		$	3.47
Granted	322		1.85
Vested	(80	)	1.83
Forfeited	(52	)	—
Nonvested at September 27, 2015	840		$	3.03

Summary of the fair value of rights issued pursuant to ESPP

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 27, 2015		September 28, 2014		September 27, 2015		September 28, 2014
Expected term (months)	6.08		6.09		6.08		6.09
Risk-free interest rate	0.08	%	0.05	%	0.08	%	0.05	%
Volatility	51.54	%	49.17	%	51.54	%	49.17	%
Dividend yield	—		—		—		—