Stock-Based Compensation (Tables)

6 Months Ended

Jul. 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 and six months ended July 2, 2017 and July 3, 2016 was as follows (in thousands):

	Three Months Ended				Six Months Ended
	July 2, 2017		July 3, 2016		July 2, 2017		July 3, 2016
Cost of revenue	$	20	$	47	$	53	$	85
Research and development	134		175		273		466
Selling, general and administrative	193		217		339		450
Total costs and expenses	$	347	$	439	$	665	$	1,001

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 six months ended July 2, 2017:

	Shares Available for Grant
	(in thousands)
Balance at January 1, 2017	2,632
Authorized	1,500
Options forfeited or expired	117
RSUs granted	(378	)
RSUs forfeited or expired	107
Balance at July 2, 2017	3,978

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 six 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	(117	)	$	2.96
Exercised	(53	)	1.31
Balance outstanding at July 2, 2017	4,809		$	2.35	3.64	$	656
Exercisable at July 2, 2017	3,968		$	2.61	2.52	$	216
Vested and expected to vest at July 2, 2017	4,636		$	2.39	3.44	$	560

Summary of activity for RSUs and PRSUs

A summary of activity for the Company's RSUs and PRSUs for the six months ended July 2, 2017 and information regarding RSUs and PRSUs outstanding and expected to vest as of July 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	378		1.57
Vested	(283	)	1.31
Forfeited	(107	)	—
Nonvested at July 2, 2017	1,358		$	1.72

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				Six Months Ended
	July 2, 2017		July 3, 2016		July 2, 2017		July 3, 2016
Expected term (months)	6.00		6.08		6.00		6.08
Risk-free interest rate	1.02	%	0.40	%	1.02	%	1.04	%
Volatility	49.71	%	54.31	%	49.71	%	61.06	%
Dividend yield	—		—		—		—