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Stockholders' Equity and Stock-Based Compensation (Tables)

9 Months Ended

Sep. 28, 2019

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 28, 2019 and September 29, 2018:

	Three Months Ended				Nine Months Ended
(in thousands)	September 28, 2019		September 29, 2018		September 28, 2019		September 29, 2018
Cost of revenues	$	16	$	23	$	45	$	68
Research and development		—		94		165		214
Sales and marketing		81		169		290		348
General and administrative		61		387		898		886
	$	158	$	673	$	1,398	$	1,516

Summary of Stock Options

The following table summarizes stock options information during the nine months ended September 28, 2019:

	Number of Shares			Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value (thousands)
Outstanding as of December 29, 2018		844,898		$	8.84
Granted		753,450		$	4.86
Exercised		(210	)	$	3.49
Canceled or forfeited		(277,243	)	$	9.31
Outstanding as of September 28, 2019		1,320,895		$	6.47	$	—

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

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

	Three Months Ended						Nine Months Ended
	September 28, 2019			September 29, 2018			September 28, 2019			September 29, 2018
Average risk free interest rate		1.58	%		2.95	%		1.75	%		2.71	%
Expected life (in years)	4.55 years			4.55 years			4.55 years			4.55 years
Dividend yield		—	%		—	%		—	%		—	%
Average volatility		48	%		41	%		45	%		41	%

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 28, 2019 is summarized below:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value (thousands)
Options outstanding		1,320,895	$	6.47		5.50	$	—
Options vested and expected to vest		1,161,856	$	6.64		5.37	$	—
Options exercisable		376,412	$	8.83		3.35	$	—

Restricted Stock Units

Information regarding the restricted stock units (“RSUs”) activity for the nine months ended September 28, 2019 is summarized below:

	Number of Shares
Outstanding as of December 29, 2018		597,121
Restricted stock units granted		74,527
Restricted stock units released		(213,498	)
Restricted stock units forfeited		(193,231	)
Outstanding as of September 28, 2019		264,919