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Stockholders’ Equity and Stock-Based Compensation (Tables)

9 Months Ended

Sep. 25, 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			1,030,085						36.09
Awards vested			(1,457,554)						16.95
Awards forfeited			(38,128)						23.82
RSUs at September 25, 2021			2,375,325						28.55

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 September 25, 2021						6,000						$	6.93					0.86						$	201
Vested and expected to vest at September 25, 2021						6,000						$	6.93					0.86						$	201
Exercisable at September 25, 2021						6,000						$	6.93					0.86						$	201

Schedule of ESPP Activity

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

						Nine Months Ended
						September 25, 2021
Shares issued						378,584
Weighted average per share purchase price						$	25.91
Weighted average per share discount from the fair value of our common stock on the date of issuance						$	(13.53)

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 25, 2021						September 26, 2020						September 25, 2021						September 26, 2020
Cost of revenues			$	1,392					$	962					$	3,806					$	2,800
Research and development			2,010						1,326						5,362						4,154
Selling, general and administrative			4,518						3,221						12,417						9,820
Total stock-based compensation			$	7,920					$	5,509					$	21,585					$	16,774

Schedule of Unrecognized Stock-based Compensation

At September 25, 2021, the unrecognized stock-based compensation was as follows (dollars in thousands): 

			Unrecognized Expense						Average Expected Recognition Period in Years
Restricted stock units			$	43,364					2.33
Performance restricted stock units			13,523						2.28
Employee stock purchase plan			1,806						0.36
Total unrecognized stock-based compensation expense			$	58,693					2.26

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