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Stockholders' Equity and Stock-Based Compensation (Tables)

6 Months Ended

Jun. 29, 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 six months ended June 29, 2019 and June 30, 2018:

	Three Months Ended				Six Months Ended
(in thousands)	June 29, 2019		June 30, 2018		June 29, 2019		June 30, 2018
Cost of revenues	$	10	$	21	$	29	$	45
Research and development		62		60		165		120
Sales and marketing		46		83		209		179
General and administrative		507		251		837		499
	$	625	$	415	$	1,240	$	843

Summary of Stock Options

The following table summarizes stock options information during the six months ended June 29, 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		731,700		$	4.90
Exercised		(210	)	$	3.49
Canceled or forfeited		(170,911	)	$	9.68
Outstanding as of June 29, 2019		1,405,477		$	6.68	$	21

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						Six Months Ended
	June 29, 2019			June 30, 2018			June 29, 2019			June 30, 2018
Average risk free interest rate		1.74	%		2.65	%		1.76	%		2.60	%
Expected life (in years)	4.55 years			4.55 years			4.55 years			4.55 years
Dividend yield	—%			—%			—%			—%
Average volatility		45	%		40	%		45	%		40	%

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

Information regarding stock options outstanding, vested, expected to vest, and exercisable as of June 29, 2019 is summarized below:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value (thousands)
Options outstanding		1,405,477	$	6.68		5.31	$	21
Options vested and expected to vest		1,227,921	$	6.88		5.11	$	20
Options exercisable		442,940	$	8.93		2.59	$	14

Restricted Stock Units

Information regarding the restricted stock units (“RSUs”) activity for the six months ended June 29, 2019 is summarized below:

	Number of Shares
Outstanding as of December 29, 2018		597,121
Restricted stock units granted		—
Restricted stock units released		(166,916	)
Restricted stock units forfeited		(172,441	)
Outstanding as of June 29, 2019		257,764