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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 29, 2019
Schedule of stock-based compensation costs recognized in the Condensed Consolidated Statements of Operations | 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
​ | ​ | June 29, | ​ | June 30, | ​ | June 29, | ​ | June 30,
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018
Cost of revenues | ​ | $ | 326 | ​ | $ | 294 | ​ | $ | 645 | ​ | $ | 590
Research and development | ​ |  | 6,459 | ​ | ​ | 5,669 | ​ |  | 12,556 | ​ |  | 11,438
Selling, general and administrative | ​ |  | 6,884 | ​ | ​ | 6,156 | ​ |  | 13,052 | ​ |  | 12,283
​ | ​ |  | 13,669 | ​ | ​ | 12,119 | ​ |  | 26,253 | ​ |  | 24,311
Income tax (expense) benefit | ​ |  | (2,186) | ​ | ​ | 1,677 | ​ |  | 1,134 | ​ |  | 6,896
​ | ​ | $ | 15,855 | ​ | $ | 10,442 | ​ | $ | 25,119 | ​ | $ | 17,415

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + Details
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