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Intangible assets - Note 7 | 12 Months Ended
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Dec. 31, 2015
Notes to Financial Statements |
Intangible assets - Note 7 | 7. INTANGIBLE ASSETS Our intangible assets consist exclusively of technology-based purchased patents. Our patents are amortized using the straight-line method over their estimated period of benefit, ranging from one to seventeen years. The gross value of our intangible assets was $1.6 million in each of the years ended December 31, 2015 and 2014. Amortization expense was $128,000 in 2015, compared to $132,000 in 2014 and $158,000 in 2013. In 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. In 2013, we recorded an impairment amounting to $277,000 on forty-two patents that were abandoned in prosecution. The following table outlines our estimated future amortization expense related to intangible assets held at December 31, 2015 (in thousands):
Years Ended December 31, |  |  | Amount
2016 |  | $ | 127
2017 |  |  | 116
2018 |  |  | 115
2019 |  |  | 115
2020 |  |  | 98
Thereafter |  |  | 274
|  | $ | 845

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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=26713463&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=26713463&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=26713463&loc=d3e16373-109275 + Details
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