Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 3,783	$ 3,177
Cost of sales	2,751	3,079
Gross profit	1,032	98
Operating expenses:
Product development	282	526
Selling, general, and administrative	2,027	2,241
Restructuring		134
Total operating expenses	2,295	2,901
Loss from operations	(1,263)	(2,803)
Other expenses (income):
Interest expense	133	43
Income from change in fair value of warrants	(873)	0
Other expenses	18	19
Net loss	$ (541)	$ (2,865)
Denominator:
Net loss	$ (0.04)	$ (0.24)
Weighted average common shares outstanding:
Basic and diluted	15,430	12,126