Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of intangible assets

Intangible assets consist of the following (in thousands):

	Useful Life in Years	September 30, 2018			December 31, 2017
Trade name	15 - 20	$	1,208		$	1,208
Patents and know-how	5 - 12	4,113			4,113
Customer relationships	4 - 8	731			750
		6,052			6,071
Less accumulated amortization		(5,123		)	(5,020		)
		$	929		$	1,051

Schedule of estimated amortization expense

Estimated amortization expense for each of the next five years is as follows (in thousands):

Years ending December 31:
Remainder of 2018	$	40
2019	162
2020	162
2021	162
2022	143
Thereafter	260
	$	929