Supplementary Financial Information to Item 8. (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]
Net (loss) sales	$ 663	$ 1,764	$ 1,480	$ 2,061	$ 2,405	$ 2,749	$ 2,074	$ 2,637	$ 5,968	$ 9,865
Gross (loss) profit	(238)	(163)	109	(26)	189	563	393	553	(318)	1,698
Net loss	$ (2,310)	$ (2,662)	$ (2,486)	$ (2,821)	$ (2,631)	$ (1,140)	$ (2,473)	$ (1,642)	$ (10,279)	$ (7,886)
Net loss per share, basic (in dollars per share)	$ (0.23)	$ (0.29)	$ (0.35)	$ (0.44)	$ (0.50)	$ (0.22)	$ (0.59)	$ (0.45)
Net loss per share, diluted (in dollars per share)	$ (0.23)	$ (0.29)	$ (0.35)	$ (0.44)	$ (0.50)	$ (0.22)	$ (0.59)	$ (0.45)
Weighted average shares of common shares outstanding:
Basic (in shares)	9,583	9,190	4,211	6,437	5,312	5,086	4,211	3,612	8,110	4,561
Diluted (in shares)	9,583	9,190	4,211	6,437	5,312	5,086	4,211	3,612	8,110	4,561