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Intangible assets - Note 7 | 12 Months Ended
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Dec. 31, 2013
Notes to Financial Statements |
Intangible assets - Note 7 | 7. Intangible assets Our intangible assets consist entirely 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 $1.7 million and $2.3 million as of December 31, 2013 and 2012, respectively. Amortization expense was $158,000 and $184,000 in 2013 and 2012, respectively. In 2013, we recorded an impairment amounting to $277,000 on 42 patents that were abandoned in prosecution. In 2012, we recorded an impairment amounting to $284,000 on 35 patents that were abandoned in prosecution. The following table outlines the estimated future amortization expense related to intangible assets held at December 31, 2013:
Year ended December 31, |  |  |  |  |  | Amount
2014 |  |  |  |  | $ | 132,000
2015 |  |  |  |  |  | 132,000
2016 |  |  |  |  |  | 131,000
2017 |  |  |  |  |  | 120,000
2018 |  |  |  |  |  | 119,000
Thereafter |  |  |  |  |  | 511,000
Total |  |  |  |  | $ | 1,145,000

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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 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 Reference 3: 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 + Details
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