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Stockholders’ Equity and Stock-Based Compensation (Tables)

6 Months Ended

Jun. 26, 2021

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 26, 2020			2,840,922						$	19.80
Awards granted			43,949						36.71
Awards vested			(451,957)						15.95
Awards forfeited			(26,996)						22.66
RSUs at June 26, 2021			2,405,918						20.80

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 (in thousands)
Outstanding at December 26, 2020						106,000						$	8.35
Options exercised						(100,000)						8.44
Outstanding at June 26, 2021						6,000						$	6.93					1.11						$	172
Vested and expected to vest at June 26, 2021						6,000						$	6.93					1.11						$	172
Exercisable at June 26, 2021						6,000						$	6.93					1.11						$	172

Schedule of ESPP Activity

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

						Six Months Ended
						June 26, 2021
Shares issued						228,784
Weighted average per share purchase price						$	22.14
Weighted average per share discount from the fair value of our common stock on the date of issuance						$	(18.73)

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 26, 2021						June 27, 2020						June 26, 2021						June 27, 2020
Cost of revenues			$	1,079					$	901					$	2,414					$	1,838
Research and development			1,663						1,389						3,352						2,828
Selling, general and administrative			3,846						3,352						7,899						6,599
Total stock-based compensation			$	6,588					$	5,642					$	13,665					$	11,265

Schedule of Unrecognized Stock-based Compensation

At June 26, 2021, the unrecognized stock-based compensation was as follows (dollars in thousands): 

			Unrecognized Expense						Average Expected Recognition Period in Years
Restricted stock units			$	23,767					1.87
Performance restricted stock units			6,369						1.77
Employee stock purchase plan			243						0.11
Total unrecognized stock-based compensation expense			$	30,379					1.83

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