Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019	Dec. 29, 2019	Dec. 30, 2018
Cash flows from operating activities:
Net loss	$ (11,151,000)		$ (15,444,000)	$ (13,779,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	817,000		1,201,000	1,276,000
Stock-based compensation	1,739,000		3,144,000	1,901,000
Write-down of inventories	199,000		94,000	386,000
Write-off of equipment	44,000		4,000	5,000
Tax benefit from acquisition	0		(185,000)	0
Gain on disposal of assets	0		0	(62,000)
Changes in operating assets and liabilities:
Accounts receivable	303,000		218,000	(1,284,000)
Inventories	373,000		483,000	(662,000)
Other assets	533,000		229,000	(879,000)
Trade payables	298,000		(456,000)	223,000
Accrued liabilities	207,000		(1,024,000)	235,000
Deferred income	(106,000)		158,000	0
Other long-term liabilities	0		(16,000)	2,000
Net cash used in operating activities	(6,744,000)		(11,594,000)	(12,638,000)
Cash flows from investing activities:
Capital expenditures for property and equipment	(253,000)		(576,000)	(351,000)
Capitalized internal-use software	(801,000)		(365,000)	0
Cash received from business acquisition	0		20,000	0
Proceeds from sale of assets	0		0	63,000
Net cash used in investing activities	(1,054,000)		(921,000)	(288,000)
Cash flows from financing activities:
Payment of finance lease obligations	(270,000)	$ (365,000)	(365,000)	(407,000)
Proceeds from Paycheck Protection Program loan	1,191,000		0	0
Proceeds from line of credit	57,000,000		46,000,000	36,000,000
Repayment of line of credit	(57,000,000)		(46,000,000)	(27,000,000)
Proceeds from issuance of common stock	9,296,000		9,437,000	16,215,000
Stock issuance costs	(1,147,000)		(1,181,000)	(1,638,000)
Taxes paid related to net settlement of equity awards	(72,000)		(291,000)	(308,000)
Net cash provided by financing activities	8,998,000		7,600,000	22,862,000
Net (decrease) increase in cash, cash equivalents and restricted cash	1,200,000		(4,915,000)	9,936,000
Cash, cash equivalents and restricted cash at the beginning of the period	21,548,000		26,463,000	16,527,000
Cash, cash equivalents, and restricted cash at the end of the period	22,748,000	$ 21,548,000	21,548,000	26,463,000
Supplemental disclosures of cash flow information:
Interest paid	277,000		300,000	89,000
Income taxes paid	24,000		126,000	171,000
Fair value of common stock issued as consideration for business acquisition	0		903,000	0
Finance lease obligation to finance capital expenditures	670,000		471,000	424,000
Purchase of equipment included in accounts payable	$ 0		$ 0	$ 5,000