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Summary of Significant Accounting Policies - Intangible Assets (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Summary of Significant Accounting Policies |
Impairment charges of intangible assets | $ 13,000

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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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