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Intangible Assets, net (Tables) | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible assets | Intangible assets consisted of the following for the periods indicated (in thousands):
|  | June 30, 2018 |
|  | Gross |  | Accumulated |  | Intangible |
|  | Amount |  | amortization |  | assets, net |
Patents |  | $ | 6,736 |  | $ | (2,760) |  | $ | 3,976 |
Trademarks |  |  | 14 |  |  | (12) |  |  | 2 |
Total intangible assets |  | $ | 6,750 |  | $ | (2,772) |  | $ | 3,978 |
|  | December 31, 2017 |
|  | Gross |  | Accumulated |  | Intangible |
|  | Amount |  | amortization |  | assets, net |
Patents |  | $ | 6,524 |  | $ | (2,519) |  | $ | 4,005 |
Trademarks |  |  | 14 |  |  | (12) |  |  | 2 |
Total intangible assets |  | $ | 6,538 |  | $ | (2,531) |  | $ | 4,007 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + 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) -URI http://asc.fasb.org/extlink&oid=66006027&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 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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