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Employee Benefit Plans and Stock-based compensation - Stock-based Compensation in Opex (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 25, 2020 | Sep. 27, 2019 | Sep. 25, 2020 | Sep. 27, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation | $ 3,930 | $ 4,096 | $ 13,737 | $ 8,719
Cost of Revenue [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation | 284 | 410 | 1,366 | 830
Research and Development Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation | 1,110 | 1,120 | 3,720 | 2,318
Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation | 2,536 | 2,566 | 8,651 | 5,571
Operating Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation | $ 3,646 | $ 3,686 | $ 12,371 | $ 7,889

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