Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule of inventory

	December 31,
	2019			2018
Raw materials	$	1,035		$	1,117
Work in progress		-			3
Finished goods		149			145
Total inventory		1,184			1,265
Less:
Reserve for obsolete		(4	)		(4	)
Total net inventory	$	1,180		$	1,261

Schedule of employee stock-based compensation expense

	Twelve Months Ended December 31,
	2019		2018
Research and development	$	14	$	106
General and administrative		859		3,306
Total stock-based compensation expense	$	873	$	3,412

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

	December 31,
	2019		2018
Common stock purchase warrants		489,176		561,342
Restricted stock unit		5,877		6,813
Common stock options		136,489		86,089
Total		631,542		654,244