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Stock-Based Compensation - Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 02, 2021 | Jul. 03, 2020 | Jul. 02, 2021 | Jul. 03, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 28,035 | $ 16,154 | $ 62,688 | $ 30,136
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 5,902 | 5,301 | 10,596 | 10,295
Restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 15,412 | 8,599 | 27,081 | 16,396
Performance stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 4,698 | 1,429 | 22,645 | 1,925
ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 2,023 | $ 825 | $ 2,366 | $ 1,520

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