Prepaid Expenses (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2019

Dec. 31, 2018

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of prepaid expenses

	September 30,		December 31,
	2019		2018
Director compensation	$	-	$	100
Director and officer insurance		161		121
NASDAQ fees		14
Legal retainer		25		25
Marketing programs and conferences		54		53
Professional services retainer		15		8
Rent		-		19
Equipment service deposits		2		3
Foreign patent registration		22		-
Engineering, software licenses and other		11		13
Total prepaid expenses	$	304	$	342

	December 31,
	2018		2017
Director compensation	$	100	$	66
Director, officer and other insurance		121		33
Marketing programs and conferences		53		—
Legal retainer		25		25
Inventory purchase deposits		—		20
Professional service retainer		8		8
Rent		19		—
Equipment service deposits		3		7
Engineering, software licenses and other		13		11
Total prepaid expenses	$	342	$	170