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Convertible Senior Notes (Tables)
 12 Months Ended
Dec. 29, 2024
Convertible Notes [Abstract]  
Convertible senior notes balances
The following table includes the outstanding principal amount and carrying value of the 2025 Notes as of the periods indicated:
(dollars in thousands)DECEMBER 29, 2024DECEMBER 31, 2023
Principal$20,724 $104,786 
Less: unamortized debt issuance costs (1)(56)(1,138)
Net carrying amount$20,668 $103,648 
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(1)During 2024, the Company wrote off $0.8 million of debt issuance costs as a result of the Second 2025 Notes Partial Repurchase.
Convertible senior notes interest expense
Following is a summary of interest expense for the 2025 Notes by component for the periods indicated:
FISCAL YEAR
(dollars in thousands)202420232022
Coupon interest$1,783 $5,242 $8,080 
Debt issuance cost amortization280 798 1,156 
Total interest expense (1)$2,063 $6,040 $9,236 
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(1)The effective rate of the 2025 Notes over their expected life is 5.85%.