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Stockholders' Equity and Stock-Based Compensation (Tables)

9 Months Ended

Sep. 29, 2018

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 29, 2018 and September 30, 2017:

	Three Months Ended				Nine Months Ended
(in thousands)	September 29, 2018		September 30, 2017		September 29, 2018		September 30, 2017
Cost of revenues	$	23	$	39	$	68	$	131
Research and development		94		104		214		215
Sales and marketing		169		59		348		238
General and administrative		387		319		886		773
	$	673	$	521	$	1,516	$	1,357

Summary of Activity under Incentive Plan

The following table summarizes information regarding activity under the Incentive Plan during the nine months ended September 29, 2018:

	Number of Shares			Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value (thousands)
Outstanding as of December 30, 2017		857,311		$	9.49
Granted		136,435		$	6.22
Exercised		(23,750	)	$	4.10
Canceled or forfeited		(62,286	)	$	10.48
Outstanding as of September 29, 2018		907,710		$	9.07	$	132

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 29, 2018			September 30, 2017			September 29, 2018			September 30, 2017
Average risk free interest rate		2.95	%		1.80	%		2.71	%		1.79	%
Expected life (in years)	4.55 years			4.55 years			4.55 years			4.55 years
Dividend yield	—%			—%			—%			—%
Average volatility		41	%		42	%		41	%		42	%

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 29, 2018 is summarized below:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value (thousands)
Options outstanding		907,710	$	9.07		5.06	$	132
Options vested and expected to vest		848,436	$	9.09		5.00	$	126
Options exercisable		384,468	$	9.07		3.87	$	87

Restricted Stock Units and Awards

Information regarding the restricted stock units (“RSUs”) activity for the nine months ended September 29, 2018 is summarized below:

	Number of Shares
Outstanding as of December 30, 2017		361,148
Restricted stock units granted		408,750
Restricted stock units released		(76,399	)
Restricted stock units forfeited		(6,750	)
Outstanding as of September 29, 2018		686,749

Information regarding the restricted stock awards activity during the nine months ended September 29, 2018 is summarized below:

	Number of Shares
Outstanding as of December 30, 2017		4,301
Restricted stock awards granted		—
Restricted stock awards released		(4,301	)
Outstanding as of September 29, 2018		—