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Debt - Interest expense (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 01, 2023 | Apr. 02, 2022
Interest expense related to the notes |  |
Interest Expense, Total | $ 1,656 | $ 1,680
Convertible Senior Notes |  |
Interest expense related to the notes |  |
Contractual interest expense | 845 | 845
Amortization of debt issuance costs | 523 | 496
Interest Expense, Total | $ 1,368 | $ 1,341

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