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Leases - Supplemental consolidated balance sheet information (Details) - USD ($) $ in Thousands | Jun. 27, 2026 | Dec. 27, 2025
--- | --- | ---
Operating Leases |  |
Operating lease right-of-use assets | $ 1,267 | $ 541
Other current liabilities | $ 492 | 619
Other current liabilities - extensible list | Other Liabilities, Current |
Operating lease liabilities | $ 800 | 23
Total operating lease liabilities | 1,292 | 642
Finance Leases |  |
Property and equipment, at cost | 488 | 488
Accumulated depreciation | (419) | (380)
Property and equipment, net | $ 69 | 108
Property and equipment, net - extensible list | Property and equipment, net |
Other current liabilities |  | 3
Other liabilities | $ 0 | 0
Other liabilities - extensible list | Other liabilities |
Total finance lease liabilities |  | $ 3
Total finance lease liabilities - extensible list | us-gaap:AccruedLiabilitiesCurrent, Other liabilities |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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- Definition Amount, before accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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