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Stock-Based Compensation | 3 Months Ended
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Apr. 01, 2023
Stock-Based Compensation |
Stock-Based Compensation |
9. | Stock-Based Compensation
Stock-based compensation costs are based on the fair values on the date of grant for stock awards and stock options and on the date of enrollment for the employee stock purchase plans. The fair values of stock awards (such as restricted stock units (“RSUs”), performance stock units (“PSUs”) and restricted stock awards (“RSAs”)) are estimated based on their intrinsic values. The fair values of market stock awards (“MSUs”) are estimated using a Monte Carlo simulation. The fair values of stock options and employee stock purchase plans are estimated using the Black-Scholes option-pricing model. The following table presents details of stock-based compensation costs recognized in the Condensed Consolidated Statements of Income (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | April 1, | ​ | April 2,
​ |  | 2023 |  | 2022
Cost of revenues | ​ | $ | 298 | ​ | $ | 272
Research and development | ​ | ​ | 9,491 | ​ |  | 6,991
Selling, general and administrative | ​ | ​ | 6,849 | ​ |  | 5,612
​ | ​ | ​ | 16,638 | ​ |  | 12,875
Income tax benefit | ​ | ​ | 1,786 | ​ | ​ | 1,845
Total | ​ | $ | 14,852 | ​ | $ | 11,030
​ The Company had approximately $110.9 million of total unrecognized compensation cost related to equity grants as of April 1, 2023 that is expected to be recognized over a weighted-average period of approximately 2.1 years. There were no significant stock-based compensation costs capitalized into assets in any of the periods presented.

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