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Stock Based Compensation (Tables)

6 Months Ended

Jun. 28, 2014

Summary of Activity in Stock Option Plan

The following table summarizes information regarding activity in our stock option plan during the six months ended June 28, 2014:

	Number of Shares			Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value (thousands)
Outstanding as of December 28, 2013		1,102,842		$	3.97
Granted		127,500		$	8.72
Exercised		(209,610	)	$	4.05
Canceled or forfeited		(25,696	)	$	6.28
Outstanding as of June 28, 2014		995,036		$	4.50	$	3,821

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 28, 2014			June 29, 2013			June 28, 20143			June 29, 2013
Average risk free interest rate		1.45	%		1.31	%		1.48	%		0.83	%
Expected life (in years)		4.5 years			4.5 years			4.5 years			4.5 years
Dividend yield		—	%		—	%		—	%		—	%
Average volatility		55	%		79	%		57	%		84	%

Stock-Based Compensation Expense

The following table shows stock-based compensation expense included in the condensed consolidated statements of operations for the three and six months ended June 28, 2014 and June 29, 2013:

	Three Months Ended				Six Months Ended
	June 28, 2014		June 29, 2013		June 28, 2014		June 29, 2013
Cost of revenues	$	39	$	29	$	73	$	51
Research and development		26		16		48		36
Sales and marketing		28		28		60		50
General and administrative		141		100		297		197
	$	234	$	173	$	478	$	334

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

Information regarding stock options outstanding, vested and expected to vest and exercisable as of June 28, 2014 is summarized below:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value (thousands)
Options outstanding		995,036	$	4.50		4.03	$	3,821
Options vested and expected to vest		926,071	$	4.38		3.88	$	3,662
Options exercisable		564,581	$	3.58		2.69	$	2,655

Restricted Stock Units Activity

Information regarding the restricted stock units activity for the six months ended June 28, 2014 is summarized below:

	Number of Shares
Outstanding as of December 28, 2013		269,259
Restricted stock units granted		50,000
Restricted stock units released		(36,250	)
Outstanding as of June 28, 2014		283,009