Stockholders’ Equity and Stock-Based Compensation (Tables)

9 Months Ended

Sep. 26, 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	1,189,018	25.72
Awards vested	(1,446,481)	13.70
Awards forfeited	(42,384)	14.64
RSUs at September 26, 2020	2,769,153	19.52

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	(205,769)	8.32
Outstanding at September 26, 2020	156,000	$	8.38	1.39	$	2,427,060
Vested and expected to vest at September 26, 2020	156,000	$	8.38	1.39	$	2,427,060
Exercisable at September 26, 2020	156,000	$	8.38	1.39	$	2,427,060

Schedule of ESPP Activity

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

	Nine Months Ended
	September 26, 2020
Shares issued	485,566
Weighted average per share purchase price	$	16.47
Weighted average per share discount from the fair value of our common stock on the date of issuance	$	11.00

Schedule of Stock-based Compensation

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

	Three Months Ended				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Cost of revenues	$	962	$	1,117	$	2,800	$	3,031
Research and development	1,326		1,729		4,154		4,830
Selling, general and administrative	3,221		3,658		9,820		9,227
Total stock-based compensation	$	5,509	$	6,504	$	16,774	$	17,088

Schedule of Unrecognized Stock-based Compensation

At September 26, 2020, the unrecognized stock-based compensation was as follows (dollars in thousands): 

	Unrecognized Expense		Average Expected Recognition Period in Years
Restricted stock units	$	34,513	2.31
Performance restricted stock units	10,499		2.28
Employee stock purchase plan	993		0.35
Total unrecognized stock-based compensation expense	$	46,005	2.26