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Intangible Assets and Goodwill - Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 5,199 | $ 4,523
Accumulated amortization | (2,838) | (2,687)
Net value | $ 2,361 | $ 1,836
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Average amortization period | 5 years | 5 years
Gross carrying amount | $ 3,971 | $ 3,310
Accumulated amortization | (1,610) | (1,474)
Net value | $ 2,361 | $ 1,836
Arbor acquired technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Average amortization period | 3 years | 3 years
Gross carrying amount | $ 670 | $ 670
Accumulated amortization | (670) | (670)
Net value | $ 0 | $ 0
Direct nanoparticle deposition technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Average amortization period | 6 years | 6 years
Gross carrying amount | $ 558 | $ 543
Accumulated amortization | (558) | (543)
Net value | $ 0 | $ 0

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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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- Definition Amount before 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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- Definition Amount after 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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