Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2022	Apr. 03, 2021
Operating activities:
Net loss	$ (2,391)	$ (2,010)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	119	140
Stock-based compensation	384	366
Changes in operating assets and liabilities:
Accounts receivable	(434)	(900)
Receivable from related party	(303)
Inventories	(1,469)	943
Prepaid expenses and other current assets	(695)	(271)
Operating lease right-of-use assets	233	200
Other long-term assets	(8)	53
Accounts payable	683	539
Payable to related party	272
Accrued compensation	(867)	(91)
Accrued expenses	71	458
Accrued warranty	35	(42)
Deferred revenue	1,602	11,238
Operating lease liabilities	(239)	(251)
Other liabilities	(246)	1,458
Net cash (used in) provided by operating activities	(3,253)	11,830
Investing activities:
Acquisition of property and equipment	(26)	(73)
Cash paid for business combination, net		(5,343)
Net cash used in investing activities	(26)	(5,416)
Financing activities:
Proceeds from issuance of common stock, net of issuance costs		9,878
Proceeds from stock option exercise	14	17
Taxes paid related to net share settlements of equity awards	(8)	(6)
Net cash provided by financing activities	6	9,889
Effect of foreign exchange rate changes	42	64
Net (decrease) increase in cash and cash equivalents	(3,231)	16,367
Cash and cash equivalents, beginning of period	23,852	12,653
Cash and cash equivalents, end of period	20,621	29,020
Supplemental disclosure of non-cash activities:
Transfer of inventory (from) to property and equipment	$ (20)	$ 27