Stock-Based Compensation (Tables)

3 Months Ended

Apr. 02, 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 months ended April 2, 2017 and April 3, 2016 was as follows (in thousands):

	Three Months Ended
	April 2, 2017		April 3, 2016
Cost of revenue	$	33	$	38
Research and development	139		291
Selling, general and administrative	146		233
Total costs and expenses	$	318	$	562

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 three months ended April 2, 2017:

	Shares Available for Grant
	(in thousands)
Balance at January 1, 2017	2,632
Options forfeited or expired	80
RSUs granted	(136	)
RSUs forfeited or expired	101
Balance at April 2, 2017	2,677

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 first three 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	(80	)	$	3.01
Exercised	(53	)	1.31
Balance outstanding at April 2, 2017	4,846		$	2.35	3.88	$	1,136
Exercisable at April 2, 2017	3,976		$	2.61	2.74	$	449
Vested and expected to vest at April 2, 2017	4,685		$	2.39	3.70	$	999

Summary of activity for RSUs and PRSUs

A summary of activity for the Company's RSUs and PRSUs for the three months ended April 2, 2017 and information regarding RSUs and PRSUs outstanding and expected to vest as of April 2, 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	136		1.70
Vested	(52	)	1.72
Forfeited	(101	)	—
Nonvested at April 2, 2017	1,353		$	1.68

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
	April 2, 2017		April 3, 2016
Expected term (months)	6.00		6.00
Risk-free interest rate	0.57	%	0.31	%
Volatility	48.69	%	57.16	%
Dividend yield	—		—