Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020
Revenue	$ 3,858,000	$ 1,780,000	$ 8,980,000	$ 6,134,000
Cost of revenue	1,126,000	857,000	3,638,000	3,092,000
Gross profit	2,732,000	923,000	5,342,000	3,042,000
Operating expenses:
Research and development	1,807,000	1,380,000	5,346,000	5,399,000
Selling, general and administrative	2,186,000	1,478,000	5,927,000	5,022,000
Restructuring costs	0	111,000	0	624,000
Total operating expenses	3,993,000	2,969,000	11,273,000	11,045,000
Loss from operations	(1,261,000)	(2,046,000)	(5,931,000)	(8,003,000)
Interest expense	(35,000)	(36,000)	(99,000)	(299,000)
Gain on forgiveness of debt	0	0	1,192,000	0
Interest income and other income (expense), net	(7,000)	27,000	(59,000)	94,000
Loss before income taxes	(1,303,000)	(2,055,000)	(4,897,000)	(8,208,000)
Provision for (benefit from) income taxes	(21,000)	10,000	136,000	1,000
Net loss	$ (1,282,000)	$ (2,065,000)	$ (5,033,000)	$ (8,209,000)
Net loss per share:
Basic and diluted (in dollars per share)	$ (0.11)	$ (0.19)	$ (0.44)	$ (0.88)
Weighted average shares outstanding:
Basic and diluted (in shares)	11,573	11,023	11,441	9,315