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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of stock based compensation expense

Stock-based compensation expense included in the Company's consolidated financial statements for the three months ended March 31, 2019 and April 1, 2018 was as follows (in thousands):

		Three Months Ended
		March 31, 2019				April 1, 2018
Cost of revenue		$	26			$	34
Research and development			655				183
Selling, general and administrative			270				215
Total costs and expenses		$	951			$	432

Summary of the activity in the shares available for grant

The following table summarizes the activity in the shares available for grant under the 2009 Stock Plan during the three months ended March 31, 2019:

		Shares Available for Grant
		(in thousands)
Balance at December 30, 2018			6,760
Authorized			-
RSUs granted			(3,144	)
RSUs forfeited or expired			158
Options forfeited			20
Balance at March 31, 2019			3,794

Summary of stock options outstanding and stock option activity 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 three months ended March 31, 2019:

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Term				Aggregate Intrinsic Value
		(in thousands)								(in years)				(in thousands)
Balance outstanding at December 30, 2018			3,201			$	2.18
Forfeited or expired			(20	)			3.12
Exercised			(4	)			0.78
Balance outstanding at March 31, 2019			3,177			$	2.18				3.48			$	-
Exercisable at March 31, 2019			2,894			$	2.30				3.09			$	-
Vested and expected to vest at March 31, 2019			3,144			$	2.19				3.44			$	-

Summary of activity for RSUs and PRSUs

A summary of activity for the Company's RSUs for the three months ended March 31, 2019 and information regarding RSUs outstanding and expected to vest as of March 31, 2019 is as follows:

		RSUs & PRSUs Outstanding
		Number of Shares				Weighted Average Grant Date Fair Value
		(in thousands)
Nonvested at December 30, 2018			2,570			$	1.23
Granted			3,143				0.87
Vested			(697	)			1.06
Forfeited			(158	)			—
Nonvested at March 31, 2019			4,858			$	1.09

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
		March 31, 2019				April 1, 2018
Expected term (months)			6.0				6.0
Risk-free interest rate			2.37	%			1.39	%
Volatility			53.77	%			54.87	%
Dividend yield			—				—

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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