Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 03, 2021	Mar. 28, 2020
Operating activities:
Net loss		$ (2,010)	$ (1,651)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization		140	143
Stock-based compensation	$ 366	366	95
Provision for doubtful accounts			42
Changes in operating assets and liabilities:
Accounts receivable		(900)	2,292
Inventories		943	(35)
Prepaid expenses and other current assets		(271)	(290)
Operating lease right-of-use assets		200	302
Other long-term assets		53	11
Accounts payable		539	(1,091)
Accrued compensation		(91)	(681)
Accrued expenses		458	(28)
Accrued warranty		(42)	(140)
Deferred revenue		11,238	(108)
Operating lease liabilities		(251)	(343)
Other liabilities		1,458	29
Net cash provided by (used in) operating activities		11,830	(1,453)
Investing activities:
Acquisition of property and equipment		(73)	(68)
Cash paid for business combination, net		(5,343)
Net cash used in investing activities		(5,416)	(68)
Financing activities:
Proceeds from issuance of common stock, net of issuance costs		9,878
Proceeds from stock option exercise		17
Taxes paid related to net share settlements of equity awards		(6)	(2)
Net cash provided by (used in) financing activities		9,889	(2)
Effect of foreign exchange rate changes		64	9
Net decrease in cash and cash equivalents		16,367	(1,514)
Cash and cash equivalents, beginning of period		11,626	12,653
Cash and cash equivalents, end of period	$ 27,993	27,993	11,139
Supplemental disclosure of non-cash activities:
Transfer of inventory to property and equipment		$ 27	$ 48