Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Product sales	$ 7,176	$ 7,128
Revenue, Product and Service [Extensible Enumeration]	us-gaap:ProductMember	us-gaap:ProductMember
Operating expenses:
Cost of sales	$ 2,935	$ 2,781
General and administrative	4,084	4,422
Selling and marketing	1,383	1,755
Research and development	695	988
Total operating expenses	9,097	9,946
Loss from operations	(1,921)	(2,818)
Other income (expense):
Gain on forgiveness of debt	1,137
Change in fair value of warrant liability		207
Interest expense	(128)	(113)
Other income, net	13
Total other income, net	1,022	94
Net loss	$ (899)	$ (2,724)
Net loss per common share, basic and diluted	$ (0.11)	$ (0.36)
Weighted-average common shares used to compute net loss per share, basic and diluted	7,833	7,539