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Summary of Significant Accounting Policies - Goodwill and Other Intangibles (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Goodwill and Other Intangibles |  |  |
Goodwill impairment | $ | $ 0 | $ 0 | $ 0
As Previously Reported |  |  |
Goodwill and Other Intangibles |  |  |
Number of reporting units | segment | 2 |  |
Patents |  |  |
Goodwill and Other Intangibles |  |  |
Estimated useful lives of assets | 20 years |  |
Minimum | Proprietary Technology |  |  |
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 |  |  |
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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