Stock-Based Compensation (Tables)

9 Months Ended

Oct. 02, 2016

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 October 2, 2016 and September 27, 2015 was as follows (in thousands):

	Three Months Ended				Nine Months Ended
	October 2, 2016		September 27, 2015		October 2, 2016		September 27, 2015
Cost of revenue	$	34	$	29	$	119	$	95
Research and development	137		210		603		613
Selling, general and administrative	286		240		736		759
Restructuring charges *	—		29		—		29
Total costs and expenses	$	457	$	508	$	1,458	$	1,496

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

* Stock-based compensation related to restructuring plan was initiated

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
	October 2, 2016		September 27, 2015		October 2, 2016		September 27, 2015
Expected term (years)	7.12		4.78		7.12		4.78
Risk-free interest rate	1.40	%	1.40	%	1.40	%	1.40	%
Expected volatility	52.40	%	52.11	%	52.40	%	52.11	%
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 October 2, 2016:

	Shares Available for Grant
	(in thousands)
Balance at January 03, 2016	2,929
Options granted	(842	)
Options forfeited or expired	546
RSUs granted	(934	)
PRSUs granted	(193	)
RSUs forfeited or expired	554
PRSUs forfeited or expired	204
Balance at October 2, 2016	2,264

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 2016:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Term	Aggregate Intrinsic Value
	(in thousands)				(in years)	(in thousands)
Balance outstanding at January 3, 2016	5,266		$	2.64
Granted	842		$	0.86
Forfeited or expired	(546	)	$	2.79
Balance outstanding at October 2, 2016	5,562		$	2.36	4.11	$	—
Exercisable at October 2, 2016	4,494		$	2.62	2.82	$	—
Vested and expected to vest at October 2, 2016	5,263		$	2.43	3.79	$	—

Summary of activity for RSUs and PRSUs

A summary of activity for the Company's RSUs and PRSUs for the nine months ended October 2, 2016 and information regarding RSUs and PRSUs outstanding and expected to vest as of October 2, 2016 is as follows:

	RSUs & PRSUs Outstanding
	Number of Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Nonvested at January 3, 2016	1,435		$	2.30
Granted	1,127		1.05
Vested	(475	)	1.02
Forfeited	(758	)	—
Nonvested at October 2, 2016	1,329		$	1.92

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
	October 2, 2016		September 27, 2015		October 2, 2016		September 27, 2015
Expected term (months)	6.08		6.08		6.08		6.08
Risk-free interest rate	0.40	%	0.08	%	0.40	%	0.08	%
Volatility	54.31	%	51.54	%	54.31	%	51.54	%
Dividend yield	—		—		—		—