Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022
Operating activities:
Net loss	$ (4,856)	$ (4,632)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	374	269
Amortization of operating lease right-of-use assets	527	467
Stock-based compensation	873	728
Changes in operating assets and liabilities:
Accounts receivable	62	(211)
Receivable from related party	1,157	677
Inventories	(513)	(2,590)
Prepaid expenses and other current assets	252	(994)
Other long-term assets	(288)	(370)
Accounts payable	286	1,042
Payable to related party	119	(447)
Accrued compensation	(286)	(889)
Accrued expenses	(154)	127
Accrued warranty	79	49
Deferred revenue	(962)	1,622
Operating lease liabilities	(510)	(440)
Other liabilities	(144)	(231)
Net cash used in operating activities	(3,984)	(5,823)
Investing activities:
Acquisition of property and equipment	(59)	(146)
Net cash used in investing activities	(59)	(146)
Financing activities:
Proceeds from stock option exercises	37	14
Taxes paid related to net share settlements of equity awards	(63)	(61)
Net cash used in financing activities	(26)	(47)
Effect of foreign exchange rate changes	(32)	130
Net decrease in cash and cash equivalents	(4,101)	(5,886)
Cash and cash equivalents, beginning of period	13,922	23,852
Cash and cash equivalents, end of period	9,821	17,966
Supplemental disclosure of cash flow information:
Cash paid during the period for income taxes	53	77
Supplemental disclosure of non-cash activities:
Transfer of inventory to (from) property and equipment	$ 3	$ (10)