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Employee Benefit Plans (Schedule of Total Stock-Based Compensation Expense Resulting from Stock Options, RSUs, and the ESPP) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2020 | Jun. 30, 2019 | Jun. 28, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | $ 9,172 | $ 6,739 | $ 15,508 | $ 13,197
Cost of revenue |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | 1,501 | 755 | 2,206 | 1,423
Research and development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | 1,707 | 1,288 | 2,741 | 2,480
Sales and marketing |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | 1,890 | 2,085 | 3,669 | 4,126
General and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | $ 4,074 | $ 2,611 | $ 6,892 | $ 5,168

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