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Intangible Assets, net (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Gross Amount | $ 6,750 | $ 6,538
Accumulated amortization | (2,772) | (2,531)
Intangible assets, net | 3,978 | 4,007
Patents |  |
Gross Amount | 6,736 | 6,524
Accumulated amortization | (2,760) | (2,519)
Intangible assets, net | 3,976 | 4,005
Trademarks |  |
Gross Amount | 14 | 14
Accumulated amortization | (12) | (12)
Intangible assets, net | $ 2 | $ 2

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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