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Revenue recognition - Changes in Deferred Gift Card and Gift Certificate Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2025
Dec. 31, 2024
Deferred license revenue    
Disaggregation of Revenue [Line Items]    
Revenue recognized $ 45 $ 33
Deferred gift card revenue    
Disaggregation of Revenue [Line Items]    
Revenue recognized 4,157 1,245
Advanced party deposits    
Disaggregation of Revenue [Line Items]    
Revenue recognized $ 523 $ 361