Unaudited Condensed Consolidated Statements of Operations - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021
Total revenue		$ 4,541	$ 2,882	$ 8,637	$ 5,122
Cost of revenue		1,997	1,416	3,632	2,512
Gross profit		2,544	1,466	5,005	2,610
Operating expenses:
Research and development		1,190	1,652	2,523	3,539
Selling, general and administrative		1,981	1,794	4,118	3,741
Total operating expenses		3,171	3,446	6,641	7,280
Loss from operations		(627)	(1,980)	(1,636)	(4,670)
Interest expense		(22)	(32)	(55)	(64)
Gain on forgiveness of debt		0	0	0	1,192
Interest income and other income (expense), net		142	(45)	19	(52)
Loss before income taxes		(507)	(2,057)	(1,672)	(3,594)
Provision for income taxes		17	5	16	157
Net loss		$ (524)	$ (2,062)	$ (1,688)	$ (3,751)
Net loss per share:
Basic and diluted (in dollars per share)	[1]	$ (0.04)	$ (0.18)	$ (0.14)	$ (0.33)
Weighted average shares outstanding:
Basic and diluted (in shares)		12,412	11,485	12,269	11,374

[1] Net loss equals comprehensive loss for all periods presented.