Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales		$ 3,335	$ 3,082	$ 7,118	$ 6,259
Cost of sales		1,992	3,191	4,743	6,270
Gross profit (loss)		1,343	(109)	2,375	(11)
Operating expenses:
Product development		313	318	595	844
Selling, general, and administrative		1,973	1,594	4,000	3,835
Restructuring			(128)	(28)	(262)
Total operating expenses		2,272	2,040	4,567	4,941
Loss from operations		(929)	(2,149)	(2,192)	(4,952)
Other expenses (income):
Interest expense		87	26	220	69
Loss from change in fair value of warrants		3,300	0	2,427	0
Other expenses		24	79	42	98
Net loss		$ (4,340)	$ (2,254)	$ (4,881)	$ (5,119)
Net loss per share - basic and diluted
Net loss (in usd per share)		$ (1.36)	$ (0.91)	$ (1.55)	$ (2.09)
Weighted average common shares outstanding:
Basic and diluted (in shares)	[1]	3,192	2,467	3,139	2,446

[1] * Shares outstanding for prior periods have been restated for the 1-for-5 reverse stock split