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Employee Benefit Plans and Stock-based compensation - Stock-based Compensation in Opex (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2018 | Jun. 30, 2017 | Jun. 29, 2018 | Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation | $ 3,012 | $ 4,136 | $ 8,769 | $ 7,387
Cost of Sales [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation | 448 | 700 | 963 | 1,145
Research and Development Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation | 818 | 1,337 | 2,622 | 2,314
Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation | 1,746 | 2,099 | 5,184 | 3,928
Operating Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock-based compensation | $ 2,564 | $ 3,436 | $ 7,806 | $ 6,242

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