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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 28, 2020

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 and six months ended June 28, 2020 and June 30, 2019 was as follows (in thousands):

		Three Months Ended								Six Months Ended
		June 28, 2020				June 30, 2019				June 28, 2020				June 30, 2019
Cost of revenue		$	31			$	18			$	43			$	44
Research and development			486				532				22				1,187
Selling, general and administrative			224				241				278				511
Total costs and expenses		$	741			$	791			$	343			$	1,742

Summary of the activity in the shares available for grant

The following table summarizes the activity in the shares available for grant under the 2019 Plan during the six months ended June 28, 2020 (in thousands):

		Shares Available for Grants
		2019 Plan
Balance at December 29, 2019			272
Authorized shares			550
RSUs granted			(289	)
PRSU's granted			(129	)
Options cancelled			49
RSUs forfeited or expired			163
PRSUs forfeited or expired			42
Balance at June 28, 2020			658

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 2019 Plan, and the related weighted average exercise price, for the six months ended June 28, 2020:

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Term				Aggregate Intrinsic Value
		(in thousands)								(in years)				(in thousands)
Balance outstanding at December 29, 2019			185			$	32.09			3.32					—
Forfeited or expired			(48	)			—
Exercised			—				—
Balance outstanding at June 28, 2020			137			$	29.51				3.81			$	—
Exercisable at June 28, 2020			134			$	29.93				3.75			$	—
Vested and expected to vest at June 28, 2020			137			$	29.52				3.81			$	—

Summary of Restricted Stock Units Activity

A summary of activity for the Company's RSUs for the six months ended June 28, 2020 is as follows:

		RSUs & PRSUs Outstanding
		Number of Shares				Weighted Average Grant Date Fair Value
		(in thousands)
Nonvested at December 29, 2019			377			$	12.55
Granted			418				4.50
Vested			(119	)			10.21
Forfeited			(205	)			—
Nonvested at June 28, 2020			471			$	7.99

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
		June 28, 2020				June 30, 2019				June 28, 2020				June 30, 2019
Expected term (months)			6.08				6.00				6.08				6.00
Risk-free interest rate			0.15	%			2.40	%			0.15	%			2.40	%
Volatility			88.35	%			53.77	%			88.35	%			53.77	%
Dividend yield			—				—				—				—

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