Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Net sales	$ 2,061	$ 2,637
Cost of sales	2,087	2,084
Gross (loss) profit	(26)	553
Operating expenses:
Product development	503	653
Selling, general, and administrative	2,127	2,218
Restructuring recovery	0	(19)
Total operating expenses	2,630	2,852
Loss from operations	(2,656)	(2,299)
Other expenses (income):
Interest expense	184	127
Gain on forgiveness of PPP loan	0	(801)
Other income	(30)	0
Other expenses	11	17
Net loss	$ (2,821)	$ (1,642)
Net loss per common share - basic and diluted
Net loss, basic (USD per share)	$ (0.44)	$ (0.45)
Net loss, diluted (USD per share)	$ (0.44)	$ (0.45)
Weighted average shares of common stock outstanding:
Diluted weighted average common shares outstanding (in shares)	6,437	3,612
Basic weighted average common shares outstanding (in shares)	6,437	3,612