Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Activity under Incentive Plan

The following table summarizes information regarding activity under the Incentive Plan during the three months ended March 31, 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		38,600		$	5.88
Exercised		(6,250	)	$	3.72
Canceled or forfeited		(22,113	)	$	11.80
Outstanding as of March 31, 2018		867,548		$	9.31	$	78

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
	March 31, 2018			April 1, 2017
Average risk free interest rate		2.53	%		1.78	%
Expected life (in years)	4.55 years			4.55 years
Dividend yield	—%			—%
Average volatility		41	%		42	%

Stock-Based Compensation Expense

The following table shows stock-based compensation expense included in the condensed consolidated statements of operations for the three months ended March 31, 2018 and April 1, 2017:

	Three Months Ended
	March 31, 2018		April 1, 2017
Cost of revenues	$	24	$	36
Research and development		60		44
Sales and marketing		96		73
General and administrative		248		239
	$	428	$	392

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

Information regarding stock options outstanding, vested, expected to vest, and exercisable as of March 31, 2018 is summarized below:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate IntrinsicValue (thousands)
Options outstanding		867,548	$	9.31		5.25	$	78
Options vested and expected to vest		798,665	$	9.29		5.16	$	78
Options exercisable		272,540	$	8.45		3.14	$	78

Restricted Stock Units and Awards

Information regarding the restricted stock units (“RSUs”) activity for the three months ended March 31, 2018 is summarized below:

	Number of Shares
Outstanding as of December 30, 2017		361,148
Restricted stock units granted		6,300
Restricted stock units released		(52,213	)
Restricted stock units cancelled		(750	)
Outstanding as of March 31, 2018		314,485

Information regarding the RSUs granted with performance conditions activity for the three months ended March 31, 2018 is summarized below:

	Number of Shares
Outstanding as of December 30, 2017		4,301
Restricted stock awards granted		—
Restricted stock awards released		—
Outstanding as of March 31, 2018		4,301