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Convertible Senior Notes (Tables)
 6 Months Ended
Jun. 30, 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)JUNE 30, 2024DECEMBER 31, 2023
Principal$20,724 $104,786 
Less: unamortized debt issuance costs (1)(138)(1,138)
Net carrying amount$20,586 $103,648 
________________
(1)During the twenty-six weeks ended June 30, 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 ENDEDTWENTY-SIX WEEKS ENDED
(dollars in thousands)JUNE 30, 2024JUNE 25, 2023JUNE 30, 2024JUNE 25, 2023
Coupon interest$259 $1,310 $1,265 $2,622 
Debt issuance cost amortization40 198 198 394 
Total interest expense (1)$299 $1,508 $1,463 $3,016 
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(1)The effective rate of the 2025 Notes over their expected life is 5.85%. The decrease in interest expense during the thirteen and twenty-six weeks ended June 30, 2024 relates to the 2025 Notes Partial Repurchase in February 2024.