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Stock-Based Compensation (Tables) | 9 Months Ended
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Oct. 02, 2021
Stock-Based Compensation |
Schedule of stock-based compensation costs recognized in the Condensed Consolidated Statements of Income | The following table presents details of stock-based compensation costs recognized in the Condensed Consolidated Statements of Income (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | October 2, | ​ | October 3, | ​ | October 2, | ​ | October 3,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Cost of revenues | ​ | $ | 261 | ​ | $ | 262 | ​ | $ | 696 | ​ | $ | 717
Research and development | ​ | ​ | 7,071 | ​ | ​ | 5,821 | ​ | ​ | 18,190 | ​ |  | 17,354
Selling, general and administrative | ​ | ​ | 6,964 | ​ | ​ | 5,708 | ​ | ​ | 18,030 | ​ |  | 18,181
​ | ​ | ​ | 14,296 | ​ | ​ | 11,791 | ​ | ​ | 36,916 | ​ |  | 36,252
Income tax (expense) benefit | ​ | ​ | (627) | ​ | ​ | 900 | ​ | ​ | 632 | ​ | ​ | 3,022
​ | ​ | $ | 14,923 | ​ | $ | 10,891 | ​ | $ | 36,284 | ​ | $ | 33,230

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