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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure Of Compensation Related Costs Sharebased 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 30, 2018 and October 1, 2017 was as follows (in thousands):

		Three Months Ended								Nine Months Ended
		September 30, 2018				October 1, 2017				September 30, 2018				October 1, 2017
Cost of revenue		$	30			$	32			$	99			$	85
Research and development			220				151				610				424
Selling, general and administrative			266				212				718				551
Total costs and expenses		$	516			$	395			$	1,427			$	1,060

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 30, 2018:

		Shares Available for Grant
		(in thousands)
Balance at December 31, 2017			3,899
Authorized			4,000
RSUs granted			(1,389	)
RSUs forfeited or expired			151
Options forfeited			50
Balance at September 30, 2018			6,711

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 2018:

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Term				Aggregate Intrinsic Value
		(in thousands)								(in years)				(in thousands)
Balance outstanding at December 31, 2017			3,558			$	2.09
Forfeited or expired			(50	)
Exercised			(5	)			—
Balance outstanding at September 30, 2018			3,503			$	2.08				3.64			$	131
Exercisable at September 30, 2018			3,116			$	2.22				3.11			$	80
Vested and expected to vest at September 30, 2018			3,441			$	2.10				3.56			$	122

Summary of activity for RSUs and PRSUs

A summary of activity for the Company's RSUs for the nine months ended September 30, 2018 and information regarding RSUs outstanding and expected to vest as of September 30, 2018 is as follows:

		RSUs & PRSUs Outstanding
		Number of Shares				Weighted Average Grant Date Fair Value
		(in thousands)
Nonvested at December 31, 2017			2,363			$	1.54
Granted			1,388				1.50
Vested			(827	)			1.28
Forfeited			(150	)			—
Nonvested at September 30, 2018			2,774			$	1.59

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 30, 2018				October 1, 2017				September 30, 2018				October 1, 2017
Expected term (months)			6.00				6.0				6.00				6.00
Risk-free interest rate			2.09	%			1.02	%			2.09	%			1.02	%
Volatility			44.76	%			49.71	%			44.76	%			49.71	%
Dividend yield			—				—				—				—

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