Debt - Interest expense (Details) - USD ($) $ in Thousands	3 Months Ended
Apr. 02, 2022	Apr. 03, 2021
Interest expense related to the notes
Interest Expense, Total	$ 1,680	$ 11,324
Convertible Senior Notes
Interest expense related to the notes
Contractual interest expense	845	1,163
Amortization of debt discount		5,938
Amortization of debt issuance costs	496	518
Interest Expense, Total	$ 1,341	$ 7,619

Amount of the cost of borrowed funds accounted for as interest expense.

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Name:	us-gaap_InterestExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration