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Stock-Based Compensation (Tables) | 6 Months Ended
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Jul. 03, 2021
Stock-Based Compensation |
Schedule of stock-based compensation costs recognized in the Condensed Consolidated Statements of Income | 11. Stock-Based Compensation (Continued) ​ The following table presents details of stock-based compensation costs recognized in the Condensed Consolidated Statements of Operations (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | July 3, | ​ | July 4, | ​ | July 3, | ​ | July 4,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Cost of revenues | ​ | $ | 199 | ​ | $ | 200 | ​ | $ | 436 | ​ | $ | 375
Research and development | ​ | ​ | 5,488 | ​ | ​ | 5,612 | ​ | ​ | 11,118 | ​ |  | 11,534
Selling, general and administrative | ​ | ​ | 5,565 | ​ | ​ | 6,006 | ​ | ​ | 11,066 | ​ |  | 12,552
​ | ​ | ​ | 11,252 | ​ | ​ | 11,818 | ​ | ​ | 22,620 | ​ |  | 24,461
Income tax benefit | ​ | ​ | 577 | ​ | ​ | 945 | ​ | ​ | 1,259 | ​ |  | 2,122
​ | ​ | $ | 10,675 | ​ | $ | 10,873 | ​ | $ | 21,361 | ​ | $ | 22,339

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