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Intangible assets - Note 7 | 12 Months Ended
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Dec. 31, 2014
Notes to Financial Statements |
Intangible assets - Note 7 | 7. Intangible assets Our intangible assets consist exclusively of technology-based purchased patents. The patents are amortized using the straight-line method over their estimated period of benefit, ranging from one to 17 years. The gross value of our intangible assets was $1.6 million as of December 31, 2014 and 2013. Amortization expense was $132,000 and $158,000 in 2014 and 2013, respectively. In 2014, we recorded an impairment amounting to $40,000 on 5 patents that were abandoned in prosecution. In 2013, we recorded an impairment amounting to $277,000 on 42 patents that were abandoned in prosecution. The following table outlines the estimated future amortization expense related to intangible assets held at December 31, 2014:
Year ended December 31, |  |  |  |  |  | Amount
2015 |  |  |  |  | $ | 128,000
2016 |  |  |  |  |  | 127,000
2017 |  |  |  |  |  | 116,000
2018 |  |  |  |  |  | 115,000
2019 |  |  |  |  |  | 115,000
Thereafter |  |  |  |  |  | 372,000
Total |  |  |  |  | $ | 973,000

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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 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: 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 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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