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Intangible assets - Note 7 | 12 Months Ended
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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

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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