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Stock-Based Compensation (Tables) | 6 Months Ended
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Jul. 03, 2020
Share-based Payment Arrangement [Abstract] |
Allocated Employee Stock-Based Compensation Expense | We allocated the stock-based compensation expense for our equity incentive plans and our 2000 Employee Stock Purchase Plan (ESPP) as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Research and development | $ | 6,112 |  |  | $ | 5,138 |  |  | $ | 11,198 |  |  | $ | 9,444 |
Selling, general and administrative | 10,042 |  |  | 9,941 |  |  | 18,938 |  |  | 18,164 |
Total stock-based compensation | $ | 16,154 |  |  | $ | 15,079 |  |  | $ | 30,136 |  |  | $ | 27,608 |

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