Accounts Payable and Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2017

Payables and Accruals [Abstract]

Accounts Payable and Accrued Expenses

	2017		2016
Accounts payable	$	1,004	$	1,127
Accrued franchise taxes		342		342
Accrued directors fees		45		55
Accrued professional fees		76		135
Warranty reserve		187		27
Accrued salaries, vacation and related expenses		1,415		1,262
Other accrued expenses		183		216
Total accounts payable and accrued expenses	$	3,252	$	3,164