Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Sales:
Total sales, net	$ 1,840	$ 2,170	$ 5,780	$ 8,046
Product cost of goods sold	493	536	1,562	3,157
Gross profit	1,347	1,634	4,218	4,889
Operating expenses:
Research and development	10	125	36	249
Sales and marketing	1,855	1,692	5,323	4,675
General and administrative	1,771	1,879	4,527	4,633
Total operating expenses	3,636	3,696	9,886	9,557
Operating loss	(2,289)	(2,062)	(5,668)	(4,668)
Non-cash loss on changes in fair value of warrant liability	0	(1,589)	0	(5,224)
Non-cash gain on changes in fair value of embedded derivative liability	0	1	0	3
Other income, net	0	429	2	605
Loss before provision for income taxes	(2,289)	(3,221)	(5,666)	(9,284)
Provision for income taxes	0	0	0	(1)
Net loss and comprehensive loss	$ (2,289)	$ (3,221)	$ (5,666)	$ (9,285)
Net loss per share (basic and diluted) (in dollars per share)	$ (0.05)	$ (0.08)	$ (0.13)	$ (0.28)
Weighted-average shares of common stock used in computing net loss per share (basic and diluted) (in shares)	44,921	40,037	43,100	32,614
Product [Member]
Sales:
Total sales, net	$ 1,834	$ 2,167	$ 5,761	$ 8,038
Product and Service, Other [Member]
Sales:
Total sales, net	$ 6	$ 3	$ 19	$ 8