Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2023	Apr. 02, 2022
Operating activities:
Net loss	$ (2,090)	$ (2,391)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	144	119
Amortization of operating lease right-of-use assets	242	233
Stock-based compensation	473	384
Changes in operating assets and liabilities:
Accounts receivable	(453)	(434)
Receivable from related party	(289)	(303)
Inventories	(629)	(1,469)
Prepaid expenses and other current assets	(182)	(695)
Other long-term assets	(96)	(8)
Accounts payable	(313)	683
Payable to related party	108	272
Accrued compensation	366	(867)
Accrued expenses	584	71
Accrued warranty	46	35
Deferred revenue	(417)	1,602
Operating lease liabilities	(251)	(239)
Other liabilities	(86)	(246)
Net cash used in operating activities	(2,843)	(3,253)
Investing activities:
Acquisition of property and equipment	(43)	(26)
Net cash used in investing activities	(43)	(26)
Financing activities:
Proceeds from stock option exercises	37	14
Taxes paid related to net share settlements of equity awards	0	(8)
Net cash provided by financing activities	37	6
Effect of foreign exchange rate changes	(25)	42
Net decrease in cash and cash equivalents	(2,874)	(3,231)
Cash and cash equivalents, beginning of period	13,922	23,852
Cash and cash equivalents, end of period	11,048	20,621
Supplemental disclosure of non-cash activities:
Transfer of inventory to (from) property and equipment	$ 4	$ (20)