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Stock-Based Compensation (Tables)

9 Months Ended

Oct. 01, 2017

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 1, 2017 and October 2, 2016 was as follows (in thousands):



	Three Months Ended				Nine Months Ended
	October 1, 2017		October 2, 2016		October 1, 2017		October 2, 2016
Cost of revenue	$	32	$	34	$	85	$	119
Research and development	151		137		424		603
Selling, general and administrative	212		286		551		736
Total costs and expenses	$	395	$	457	$	1,060	$	1,458

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 1, 2017:



	Shares Available for Grant
	(in thousands)
Balance at January 1, 2017	2,632
Authorized	1,500
Options forfeited or expired	942
RSUs granted	(1,737	)
RSUs forfeited or expired	240
Balance at October 1, 2017	3,577

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 2009 Plan, and the related weighted average exercise price, for the nine months of 2017:



	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Term	Aggregate Intrinsic Value
	(in thousands)				(in years)	(in thousands)
Balance outstanding at January 1, 2017	4,979		$	2.35
Forfeited or expired	(942	)	$	2.61
Exercised	(62	)	$	1.33
Balance outstanding at October 1, 2017	3,975		$	2.30	4.12	$	880
Exercisable at October 1, 2017	3,345		$	2.53	3.26	$	422
Vested and expected to vest at October 1, 2017	3,838		$	2.35	3.95	$	774

Summary of activity for RSUs and PRSUs

A summary of activity for the Company's RSUs and PRSUs for the nine months ended October 1, 2017 and information regarding RSUs and PRSUs outstanding and expected to vest as of October 1, 2017 is as follows:



	RSUs & PRSUs Outstanding
	Number of Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Nonvested at January 1, 2017	1,370		$	1.68
Granted	1,737		1.40
Vested	(357	)	1.33
Forfeited	(240	)	—
Nonvested at October 1, 2017	2,510		$	1.55

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 1, 2017		October 2, 2016		October 1, 2017		October 2, 2016
Expected term (months)	6.00		6.08		6.00		6.08
Risk-free interest rate	1.02	%	0.40	%	1.02	%	0.40	%
Volatility	49.71	%	54.31	%	49.71	%	54.31	%
Dividend yield	—		—		—		—