Stockholders’ Equity and Stock-Based Compensation (Tables)

6 Months Ended

Jun. 27, 2020

Equity [Abstract]

Schedule of Restricted Stock Unit Activity

Restricted stock unit ("RSU") activity under our equity incentive plan was as follows:

	Units	Weighted Average Grant Date Fair Value
RSUs at December 28, 2019	3,069,000	$	14.30
Awards granted	65,686	23.92
Awards vested	(465,440)	14.84
Awards forfeited	(29,552)	14.23
RSUs at June 27, 2020	2,639,694	14.45

Schedule of Stock Option Activity

Stock option activity under our equity incentive plan was as follows:

	Options Outstanding	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life in Years	Aggregate Intrinsic Value
Outstanding at December 28, 2019	361,769	$	8.35
Options exercised	(105,769)	8.21
Outstanding at June 27, 2020	256,000	$	8.41	1.63	$	4,816,740
Vested and expected to vest at June 27, 2020	256,000	$	8.41	1.63	$	4,816,740
Exercisable at June 27, 2020	256,000	$	8.41	1.63	$	4,816,740

Schedule of ESPP Activity

Information related to activity under our Employee Stock Purchase Plan ("ESPP") was as follows:

	Six Months Ended
	June 27, 2020
Shares issued	311,591
Weighted average per share purchase price	$	13.05
Weighted average per share discount from the fair value of our common stock on the date of issuance	$	12.26

Schedule of Stock-based Compensation

Stock-based compensation was included in our Condensed Consolidated Statements of Income as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 27, 2020		June 29, 2019		June 27, 2020		June 29, 2019
Cost of revenues	$	901	$	964	$	1,838	$	1,914
Research and development	1,389		1,582		2,828		3,101
Selling, general and administrative	3,352		2,743		6,599		5,569
Total stock-based compensation	$	5,642	$	5,289	$	11,265	$	10,584

Schedule of Unrecognized Stock-based Compensation

At June 27, 2020, the unrecognized stock-based compensation was as follows (dollars in thousands): 

	Unrecognized Expense		Average Expected Recognition Period in Years
Restricted stock units	$	17,242	1.61
Performance restricted stock units	4,518		1.64
Employee stock purchase plan	165		0.10
Total unrecognized stock-based compensation expense	$	21,925	1.61