Intangible assets - Note 7

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

Intangible assets - Note 7

7. INTANGIBLE ASSETS

Our intangible assets consist exclusively of technology-based purchased patents. The gross value of our intangible assets was $1.6 million in each of the years ended December 31, 2017 and 2016. Amortization expense was $116,000 in 2017, $127,000 in 2016, and $128,000 in 2015. In 2017, 2016, and 2015 there were no impairments recorded and none of our patents were abandoned in prosecution. The following table outlines our estimated future amortization expense related to intangible assets held at December 31, 2017 (in thousands):

Years Ended December 31,		Amount
2018	$	115
2019		115
2020		98
2021		80
2022		71
Thereafter		123
	$	602