Prepaid Expenses (Tables)

9 Months Ended

Sep. 30, 2018

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

Schedule of prepaid expenses

Prepaid expenses consist of the following:

	September 30,		December 31,
	2018		2017
Director compensation	$	156	$	66
Director and officer insurance		102		33
NASDAQ fees		14		—
Legal retainer		25		25
Inventory purchase deposits		20		20
Professional services retainer		8		8
Equipment service deposits		5		7
Engineering, software licenses and other		6		11
Total prepaid expenses	$	336	$	170