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Stockholders’ Equity and Stock-Based Compensation
 3 Months Ended
Jul. 01, 2023
Equity [Abstract]  
Stockholders’ Equity and Stock-Based Compensation Stockholders’ Equity and Stock-Based Compensation
Common Stock Repurchase Programs
On October 26, 2020, our Board of Directors authorized a two-year program to repurchase up to $50 million of outstanding common stock to offset potential dilution from issuances of common stock under our stock-based compensation programs. During the six months ended June 25, 2022, we repurchased 676,408 shares of common stock for $26.0 million. We utilized the remaining funds available for repurchase under this program during fiscal 2022.

On May 20, 2022, our Board of Directors authorized an additional program to repurchase up to $75 million of outstanding common stock, also with the primary purpose to offset potential dilution from issuances of common stock under our stock-based compensation programs. The share repurchase program will expire on May 20, 2024. During the six months ended July 1, 2023, we did not repurchase any common stock. As of July 1, 2023, $18.6 million remained available for future repurchases.
Our policy related to repurchases of our common stock is to charge the excess of cost over par value to additional paid-in capital once the shares are retired. All repurchases were made in compliance with Rule 10b-18 under the Securities Exchange Act of 1934, as amended.

Restricted Stock Units
Restricted stock unit (“RSU”) activity under our equity incentive plan was as follows:
UnitsWeighted Average Grant Date Fair Value
RSUs at December 31, 20222,227,081 $35.28 
Awards granted1,014,619 30.97 
Awards vested(75,144)37.76 
Awards forfeited(122,881)35.09 
RSUs at July 1, 20233,043,675 33.78 

Performance Restricted Stock Units
We may grant Performance RSUs (“PRSUs”) to certain executives, which vest based upon us achieving certain market performance criteria. There were no market based PRSUs granted during the six months ended July 1, 2023. PRSUs are included as part of the RSU activity above.

Employee Stock Purchase Plan
Information related to activity under our Employee Stock Purchase Plan (“ESPP”) was as follows:
 Six Months Ended
 July 1, 2023
Shares issued210,055 
Weighted average per share purchase price$23.92 
Weighted average per share discount from the fair value of our common stock on the date of issuance$(4.22)

Stock-Based Compensation
Stock-based compensation was included in our Condensed Consolidated Statements of Income as follows (in thousands):
Three Months EndedSix Months Ended
July 1,
2023		June 25,
2022		July 1,
2023		June 25,
2022
Cost of revenues$1,515 $734 $3,425 $1,812 
Research and development2,363 1,695 4,735 3,681 
Selling, general and administrative5,326 3,929 10,334 8,385 
Total stock-based compensation$9,204 $6,358 $18,494 $13,878 
 
Unrecognized Compensation Costs
At July 1, 2023, the unrecognized stock-based compensation was as follows (dollars in thousands): 
Unrecognized ExpenseAverage Expected
Recognition Period
in Years
Restricted stock units$60,794 2.28
Performance restricted stock units7,789 1.72
Employee stock purchase plan246 0.09
Total unrecognized stock-based compensation expense$68,829 2.22