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Convertible Senior Notes (Tables)
 9 Months Ended
Sep. 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)SEPTEMBER 29, 2024DECEMBER 31, 2023
Principal$20,724 $104,786 
Less: unamortized debt issuance costs (1)(97)(1,138)
Net carrying amount$20,627 $103,648 
________________
(1)During the thirty-nine weeks ended September 29, 2024, the Company wrote off $0.8 million of debt issuance costs as a result of the 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:
THIRTEEN WEEKS ENDEDTHIRTY-NINE WEEKS ENDED
(dollars in thousands)SEPTEMBER 29, 2024SEPTEMBER 24, 2023SEPTEMBER 29, 2024SEPTEMBER 24, 2023
Coupon interest$259 $1,310 $1,524 $3,932 
Debt issuance cost amortization41 201 239 594 
Total interest expense (1)$300 $1,511 $1,763 $4,526 
________________
(1)The effective rate of the 2025 Notes over their expected life is 5.85%. The decrease in interest expense during the thirteen and thirty-nine weeks ended September 29, 2024 relates to the 2025 Notes Partial Repurchase in February 2024.