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Intangible Assets, net | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Note 8. Intangible Assets, net 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 |
For the three months ended June 30, 2018 and 2017, amortization expense for intangible assets, included in general and administrative expenses on the income statement, was each $0.1 million. For the six months ended June 30, 2018 and 2017, amortization expense for intangible assets, included in general and administrative expenses on the income statement, was each $0.3 million. The remaining weighted average amortization period for intangible assets is approximately 8 years.

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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 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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