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Intangible Assets and Goodwill (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets | The details of the intangibles are as follows:
| March 31, 2018
(in thousands) | Average amortization period |  | Gross carrying amount |  | Accumulated amortization |  | Net value
Amortizing intangible assets: |  |  |  |  |  |  |
Patents | 5 yrs |  | $ | 3,971 |  |  | $ | (1,610 | ) |  | $ | 2,361 |
Arbor acquired technology | 3 yrs |  | 670 |  |  | (670 | ) |  | — |
Direct nanoparticle deposition technology | 6 yrs |  | 558 |  |  | (558 | ) |  | — |
|  |  | $ | 5,199 |  |  | $ | (2,838 | ) |  | $ | 2,361 |
| December 31, 2017
(in thousands) | Average amortization period |  | Gross carrying amount |  | Accumulated amortization |  | Net value
Amortizing intangible assets: |  |  |  |  |  |  |
Patents | 5 yrs |  | $ | 3,310 |  |  | $ | (1,474 | ) |  | $ | 1,836 |
Arbor acquired technology | 3 yrs |  | 670 |  |  | (670 | ) |  | — |
Direct nanoparticle deposition technology | 6 yrs |  | 543 |  |  | (543 | ) |  | — |
|  |  | $ | 4,523 |  |  | $ | (2,687 | ) |  | $ | 1,836 |
Schedule of Estimated Future Amortization Expense | Estimated amortization expense for the remainder of 2018 and subsequent years is as follows:
(in thousands)
2018 | $ | 489 |
2019 | 612 |
2020 | 539 |
2021 | 413 |
2022 | 266 |
Thereafter | 42 |
| $ | 2,361 |

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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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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived 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 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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