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Intangible assets - Note 7 | 12 Months Ended
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Dec. 31, 2016
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, 2016 and 2015. Amortization expense was $127,000 in 2016, $128,000 in 2015, and $132,000 in 2014. In 2016 and 2015, there were no impairments recorded and none of our patents were abandoned in prosecution. In 2014, we recorded an impairment amounting to $40,000 on five patents that were abandoned in prosecution. The following table outlines our estimated future amortization expense related to intangible assets held at December 31, 2016 (in thousands):
Years Ended December 31, |  | Amount
2017 | $ | 116
2018 |  | 115
2019 |  | 115
2020 |  | 98
2021 |  | 80
Thereafter |  | 194
| $ | 718

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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 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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