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Convertible Senior Notes (Tables)
12 Months Ended
Dec. 31, 2023
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 31, 2023DECEMBER 25, 2022
Principal$104,786 $105,000 
Less: unamortized debt issuance costs(1,138)(1,939)
Net carrying amount$103,648 $103,061 
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)202320222021
Coupon interest$5,242 $8,080 $11,500 
Debt issuance cost amortization798 1,156 1,557 
Total interest expense (1)$6,040 $9,236 $13,057 
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(1)The effective rate of the 2025 Notes over their expected life is 5.85%.