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Significant Accounting Policies - Cash, Cash Equivalents, and Short-Term Investments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Significant Accounting Policies |  |
Cash equivalents | $ 12.5 | $ 1.5
Cash and cash equivalents maintained outside the United States (as a percent) | 77.00% | 54.00%

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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- References No definition available. + Details
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- Definition Represents the percentage of cash and cash equivalents maintained outside by subsidiaries. + References No definition available. + Details
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