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Stockholders’ Equity and Stock-Based Compensation (Tables)
3 Months Ended
Mar. 27, 2021
Equity [Abstract]  
Schedule of Restricted Stock Unit Activity
Restricted stock unit (“RSU”) activity under our equity incentive plan was as follows:
 
UnitsWeighted Average Grant Date Fair Value
RSUs at December 26, 20202,840,922 $19.80 
Awards granted8,765 46.25 
Awards vested(67,635)16.38 
Awards forfeited(11,140)21.21 
RSUs at March 27, 20212,770,912 19.96 
Schedule of Stock Option Activity
Stock option activity under our equity incentive plan was as follows:
Options OutstandingWeighted Average Exercise PriceWeighted Average Remaining Contractual Life in YearsAggregate Intrinsic Value
Outstanding at December 26, 2020106,000 $8.35 
Options exercised(50,000)8.44 
Outstanding at March 27, 202156,000 $8.28 0.92$2,078,820 
Vested and expected to vest at March 27, 202156,000 $8.28 0.92$2,078,820 
Exercisable at March 27, 202156,000 $8.28 0.92$2,078,820 
Schedule of ESPP Activity
Information related to activity under our Employee Stock Purchase Plan (“ESPP”) was as follows:
 Three Months Ended
 March 27, 2021
Shares issued228,784 
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
March 27,
2021
March 28,
2020
Cost of revenues$1,335 $937 
Research and development1,689 1,439 
Selling, general and administrative4,053 3,247 
Total stock-based compensation$7,077 $5,623 
Schedule of Unrecognized Stock-based Compensation
At March 27, 2021, the unrecognized stock-based compensation was as follows (dollars in thousands): 
Unrecognized ExpenseAverage Expected Recognition Period in Years
Restricted stock units$27,429 2.03
Performance restricted stock units7,719 1.93
Employee stock purchase plan973 0.86
Total unrecognized stock-based compensation expense$36,121 1.99