Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020
Operating activities:
Net loss	$ (2,782)	$ (6,150)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Gain on PPP loan forgiveness	(2,497)
Depreciation and amortization	587	399
Stock-based compensation	1,263	774
Provision for doubtful accounts		138
Loss on sale of property and equipment		13
Changes in operating assets and liabilities:
Accounts receivable	(1,240)	3,110
Inventories	(907)	1,155
Prepaid expenses and other current assets	(295)	(141)
Operating lease right-of-use assets	676	1,073
Other long-term assets	73	5
Accounts payable	2,061	(1,117)
Accrued compensation	719	(510)
Accrued expenses	563	61
Accrued warranty	(88)	(252)
Deferred revenue	11,222	(452)
Operating lease liabilities	(840)	(1,209)
Other liabilities	1,440	74
Net cash provided by (used in) operating activities	9,955	(3,029)
Investing activities:
Acquisition of property and equipment	(176)	(87)
Cash paid for business combination, net	(5,343)
Proceeds from sale of property and equipment		3
Net cash used in investing activities	(5,519)	(84)
Financing activities:
Proceeds from issuance of common stock, net of issuance costs	9,878
Proceeds from stock option exercise	175
Taxes paid related to net share settlements of equity awards	(626)	(29)
Proceeds from PPP loan		2,497
Net cash provided by financing activities	9,427	2,468
Effect of foreign exchange rate changes	79	(76)
Net increase (decrease) in cash and cash equivalents	13,942	(721)
Cash and cash equivalents, beginning of period	11,626	12,653
Cash and cash equivalents, end of period	25,568	11,932
Supplemental disclosure of cash flow information:
Cash paid during the period for income taxes	23	(25)
Supplemental disclosure of non-cash activities:
Transfer of inventory to property and equipment	123	$ 36
ROU assets obtained with the modification of operating lease	$ 2,042