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Stockholders' Equity and Stock-Based Compensation (Tables)

9 Months Ended

Sep. 26, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

The following table shows stock-based compensation expenses included in the condensed consolidated statements of operations for the three and nine months ended September 26, 2020 and September 28, 2019:

	Three Months Ended					Nine Months Ended
(in thousands)	September 26, 2020			September 28, 2019		September 26, 2020			September 28, 2019
Cost of revenues	$	46		$	16	$	105		$	45
Research and development		(27	)		—		(34	)		165
Sales and marketing		149			81		322			290
General and administrative		75			61		381			898
	$	243		$	158	$	774		$	1,398

Summary of Stock Options

The following table summarizes stock options information during the nine months ended September 26, 2020:

	Number of Shares			Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value (thousands)
Outstanding as of December 28, 2019		1,383,552		$	6.11
Granted		519,450		$	2.13
Exercised		—		$	—
Canceled or forfeited		(225,941	)	$	6.79
Outstanding as of September 26, 2020		1,677,061		$	4.79	$	3

Weighted Average Assumptions for Fair Value Estimate of Stock-Based Awards (Options)

The Company uses the Black-Scholes option-pricing model to estimate the fair value of stock-based awards (options) with the following weighted average assumptions:

	Three Months Ended						Nine Months Ended
	September 26, 2020			September 28, 2019			September 26, 2020			September 28, 2019
Average risk free interest rate		0.22	%		1.58	%		0.25	%		1.75	%
Expected life (in years)	4.55 years			4.55 years			4.55 years			4.55 years
Dividend yield		—	%		—	%		—	%		—	%
Average volatility		63	%		48	%		62	%		45	%

Summary of Stock Options Outstanding, Vested, Expected to Vest and Exercisable

Information regarding stock options outstanding, vested, expected to vest, and exercisable as of September 26, 2020 is summarized below:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value (thousands)
Options outstanding		1,677,061	$	4.79		5.46	$	3
Options vested and expected to vest		1,444,890	$	5.02		5.33	$	3
Options exercisable		558,959	$	7.11		4.07	$	—

Restricted Stock Units

Information regarding the restricted stock units (“RSUs”) activity for the nine months ended September 26, 2020 is summarized below:

	Number of Shares
Outstanding as of December 28, 2019		411,133
Restricted stock units granted		371,877
Restricted stock units released		(125,914	)
Restricted stock units forfeited		(121,535	)
Outstanding as of September 26, 2020		535,561