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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 27, 2025
Sep. 28, 2024
Operating activities:    
Net loss $ (4,253) $ (8,076)
Adjustments to reconcile net loss to net cash used in operating activities:    
Loss on inventory write-down 823 0
Loss on extinguishment of convertible note payable 1,335 0
Depreciation and amortization 372 449
Amortization of operating lease right-of-use assets 753 598
Accretion of original issue discount 58 59
Amortization of debt issuance costs 139 72
Stock-based compensation 562 927
Changes in operating assets and liabilities:    
Accounts receivable (1,181) 773
Receivable from related party 45 1,101
Inventories 2,693 (1,036)
Prepaid expenses and other current assets 302 (899)
Other long-term assets 198 126
Accounts payable (2,930) 1,702
Payable to related party (396) 351
Accrued compensation 260 223
Accrued expenses 115 (989)
Deferred revenue (1,110) (1,335)
Operating lease liabilities (825) (596)
Other liabilities 336 503
Net cash used in operating activities (2,704) (6,047)
Investing activities:    
Acquisition of property and equipment (37) (4)
Net cash used in investing activities (37) (4)
Financing activities:    
Proceeds from issuance of convertible note payable 4,000 3,370
Cash paid for debt issuance costs 0 (493)
Proceeds for stock options exercise 0 4
Payments on convertible note payable (3,961) 0
Proceeds from issuance of Series B convertible preferred stock 6,000 0
Taxes paid related to net share settlements of equity awards (48) (58)
Net cash provided by financing activities 5,991 2,823
Effect of foreign exchange rate changes (64) 54
Net increase (decrease) in cash and cash equivalents 3,186 (3,174)
Cash and cash equivalents, beginning of period 2,387 7,034
Cash and cash equivalents, end of period 5,573 3,860
Supplemental disclosure of cash flow information:    
Cash paid during the period for income taxes 24 17
Supplemental disclosure of non-cash activities:    
Debt issuance cost 360 0
Issuance of common shares in conjunction with extinguishment of convertible note payable 250 0
Issuance of incentive shares under convertible note payable $ 0 $ 250