Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Sales:
Total sales, net	$ 1,615,000	$ 3,142,000	$ 4,895,000	$ 8,883,000
Product cost of goods sold	401,000	332,000	1,145,000	1,062,000
Gross profit	1,214,000	2,810,000	3,750,000	7,821,000
Research and development	49,000	45,000	166,000	152,000
Sales and marketing	1,544,000	3,230,000	6,610,000	9,603,000
General and administrative	1,333,000	1,344,000	4,136,000	4,326,000
Total operating expenses	2,926,000	4,619,000	10,912,000	14,081,000
Operating loss	(1,712,000)	(1,809,000)	(7,162,000)	(6,260,000)
Non-cash gain on changes in fair value of warrant liability	1,480,000	267,000	936,000	971,000
Non-cash gain on changes in fair value of embedded derivative liability	669,000		423,000
Other (expense) income, net	719,000	(4,000)	1,166,000	(13,000)
Loss before provision for income taxes	(282,000)	(1,538,000)	(6,969,000)	(5,276,000)
Provision for income tax			(3,000)	(1,000)
Net loss and comprehensive loss	$ (282,000)	$ (1,538,000)	$ (6,972,000)	$ (5,277,000)
Net loss per share attributable to common stockholders (basic) (in dollars per share)	$ (0.01)	$ (0.09)	$ (0.36)	$ (0.31)
Net loss per share attributable to common stockholders (diluted) (in dollars per share)	$ (0.02)	$ (0.11)	$ (0.36)	$ (0.37)
Weighted-average shares of common stock outstanding used in computing net loss per share of common stock (basic) (in shares)	23,096	17,089	19,623	16,864
Weighted-average shares of common stock outstanding used in computing net loss per share of common stock (diluted) (in shares)	23,213	17,148	19,623	17,056
Product [Member]
Sales:
Total sales, net	$ 1,615,000	$ 3,142,000	$ 4,854,000	$ 8,870,000
Product and Service, Other [Member]
Sales:
Total sales, net			$ 41,000	$ 13,000