Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales		$ 2,637	$ 3,783
Cost of sales		2,084	2,751
Gross profit		553	1,032
Operating expenses:
Product development		653	282
Selling, general, and administrative		2,218	2,027
Restructuring		(19)	(14)
Total operating expenses		2,852	2,295
Loss from operations		(2,299)	(1,263)
Other expenses (income):
Interest expense		127	133
Gain on forgiveness of PPP loan		(801)	0
Gain from change in fair value of warrants		0	(873)
Other expenses		17	18
Net loss		$ (1,642)	$ (541)
Net loss per common share - basic and diluted
Net loss (in usd per share)		$ (0.45)	$ (0.18)
Weighted average shares of common stock outstanding:
Basic and diluted (in shares)	[1]	3,612	3,086

[1] * Shares outstanding for prior periods have been restated for the 1-for-5 reverse stock split effective June 11, 2020.