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Stockholders' Equity and Stock-Based Compensation (Tables)

3 Months Ended

Mar. 30, 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 months ended March 30, 2019 and March 31, 2018:

	Three Months Ended
(in thousands)	March 30, 2019		March 31, 2018
Cost of revenues	$	19	$	24
Research and development		103		60
Sales and marketing		163		96
General and administrative		330		248
	$	615	$	428

Summary of Activity under Incentive Plan

The following table summarizes information regarding activity under the Incentive Plan during the three months ended March 30, 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		31,700		$	4.33
Exercised		(208	)	$	3.49
Canceled or forfeited		(54,140	)	$	10.16
Outstanding as of March 30, 2019		822,250		$	8.58	$	22

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 30, 2019			March 31, 2018
Average risk free interest rate		2.15	%		2.53	%
Expected life (in years)	4.55 years			4.55 years
Dividend yield	—%			—%
Average volatility		44	%		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 March 30, 2019 is summarized below:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value (thousands)
Options outstanding		822,250	$	8.58		4.71	$	22
Options vested and expected to vest		765,064	$	8.64		4.62	$	21
Options exercisable		413,743	$	8.94		3.70	$	15

Restricted Stock Units

Information regarding the restricted stock units (“RSUs”) activity for the three months ended March 30, 2019 is summarized below:

	Number of Shares
Outstanding as of December 29, 2018		597,121
Restricted stock units granted		—
Restricted stock units released		(51,599	)
Restricted stock units forfeited		(96,000	)
Outstanding as of March 30, 2019		449,522