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Fair Value Measurements (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Recurring | Level I | Money market funds |  |
Fair value measurements |  |
Financial Assets | $ 40.7 | $ 58.7

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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