Summary of Significant Accounting Policies (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2019

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of inventory

	September 30,			December 31,
	2019			2018
Raw materials	$	1,063		$	1,111
Work in progress		3			—
Finished goods		223			154
Total inventory		1,289			1,265
Less:
Reserve for obsolete		(4	)		(4	)
Total net inventory	$	1,285		$	1,261

Schedule of employee stock-based compensation expense

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Research and development	$	1	$	29	$	11	$	87
General and administrative		203		326		661		3,003
Total stock-based compensation expense	$	204	$	355	$	675	$	3,090

Schedule of outstanding potentially dilutive securities calculation of diluted loss per share attributable to common stockholders

	September 30,
	2019		2018
Common stock purchase warrants		489,176		585,747
Restricted stock unit		5,877		8,646
Common stock options		137,389		86,289
Total		632,442		680,682

	December 31,
	2018		2017
Common stock purchase warrants		561,342		321,590
Restricted stock unit		6,813		14,395
Common stock options		86,089		82,590
Total		654,244		418,575

Schedule of cumulative effect of the changes made to the company's consolidated balance sheet

	Balance @ December 31, 2018		Adjustment Due to ASC 842			Balance @ January 1, 2019
Right to Use Asset - Long Term		—	$	87		$	87
Lease Liability – Long Term		—	$	(87	)	$	(87	)