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Summary of Significant Accounting Policies - Goodwill and Other Intangibles (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) segment | Sep. 30, 2018 USD ($) segment
Goodwill and Other Intangibles |  |
Number of reporting units | segment | 1 | 1
Goodwill impairment | $ | $ 0 | $ 0
Patents [Member] |  |
Goodwill and Other Intangibles |  |
Estimated useful lives of assets |  | 20 years
Minimum | Proprietary Technology [Member] |  |
Goodwill and Other Intangibles |  |
Estimated useful lives of assets |  | 3 years
Minimum | Customer Relationships |  |
Goodwill and Other Intangibles |  |
Estimated useful lives of assets |  | 5 years
Maximum | Proprietary Technology [Member] |  |
Goodwill and Other Intangibles |  |
Estimated useful lives of assets |  | 7 years
Maximum | Customer Relationships |  |
Goodwill and Other Intangibles |  |
Estimated useful lives of assets |  | 12 years

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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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