Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Sales:
Total sales, net	$ 1,892	$ 1,491
Product cost of goods sold	581	341
Gross profit	1,311	1,150
Operating expenses:
Research and development	9	85
Sales and marketing	1,560	3,531
General and administrative	1,277	1,605
Total operating expenses	2,846	5,221
Operating loss	(1,535)	(4,071)
Non-cash gain (loss) on changes in fair value of warrant liability	137	(57)
Non-cash gain on changes in fair value of embedded derivative liability	2
Other expense, net	(186)	(60)
Loss before provision for income taxes	(1,582)	(4,188)
Provision for income taxes		(1)
Net loss and comprehensive loss	$ (1,582)	$ (4,189)
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share)	$ (0.06)	$ (0.25)
Weighted-average shares of common stock used in computing net loss per share attributable to common stockholders (basic and diluted) (in shares)	27,978	17,093
Product [Member]
Sales:
Total sales, net	$ 1,892	$ 1,450
Product and Service, Other [Member]
Sales:
Total sales, net		$ 41