Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Sales	$ 143	$ 297
Cost of sales	101	241
Gross profit	42	56
Operating expenses:
Research and development	1,908	2,404
Selling, general and administrative	8,421	9,532
Total operating expenses	10,329	11,936
Net operating loss	(10,287)	(11,880)
Other income (expense):
Interest income	45	25
Interest expense	(42)	(74)
Other income	266	21
Total other income (expense)	269	(28)
Net loss and comprehensive loss	(10,018)	(11,908)
Warrant revaluation	11
Deemed dividend-warrant price protection-revaluation adjustment		333
Net loss attributable to common shareholders	$ (10,029)	$ (12,241)
Weighted average common shares outstanding - basic and fully diluted	1,304,045	970,105
Net loss per common share - basic and fully diluted	$ (7.69)	$ (12.62)