Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales		$ 5,964	$ 2,915	$ 13,082	$ 9,174
Cost of sales		4,588	1,887	9,331	8,157
Gross profit		1,376	1,028	3,751	1,017
Operating expenses:
Product development		401	191	996	1,035
Selling, general, and administrative		2,003	1,689	6,003	5,524
Restructuring		(16)	(19)	(44)	243
Total operating expenses		2,388	1,861	6,955	6,802
Loss from operations		(1,012)	(833)	(3,204)	(5,785)
Other expenses (income):
Interest expense		124	67	344	136
Loss on extinguishment of debt		159	0	159	0
(Gain) loss from change in fair value of warrants		(153)	0	2,274	0
Other expenses		25	46	67	144
Loss before income taxes		(1,167)	(946)	(6,048)	(6,065)
Benefit from income taxes		(2)	0	(2)	0
Net loss		$ (1,165)	$ (946)	$ (6,046)	$ (6,065)
Net loss per share - basic and diluted
Net loss (in usd per share)		$ (0.35)	$ (0.38)	$ (1.89)	$ (2.47)
Weighted average shares of common stock outstanding:
Basic and diluted (in shares)	[1]	3,308	2,474	3,196	2,455

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